E90/E92 M3 Exhaust Systems Overview

[RedLightRacer]

You really can't go wrong with any of these, can you?

Not a fan of the blue tips, though... makes me think of the 350Z forums I used to frequent.

[RedLightRacer]

Originally Posted by SS1M3

I am in the process of making a decision between these two
1. Fabspeed x pipe with dual resonators for $750 with 15hp and 8ft/lbs gains or
2. AFE XP pipe with dual HFC and dual resonators for $1625 with 18hp and 8ft/lbs gains

To me the least expensive option with desent results is Fabspeed X pipe

Are you talking about these pipes: http://www.eagleday.com/bmwm3e92x2nc...d=18283950120?

I do like the keeping the car look and feel as stock as possible, so I'm with you on option 1. Also, 'howdy' from a fellow Houstonian.

[SwagLessM3]

Anyone (or the next few to read) recommend AFE vs. REMUS? Any brand preferrable over the other? Any droning? Any suggestions or comments in general would help. Thanks in advance.

[RoyalFlushness]

Meisterschaft GT
Macht Shnell Catless X pipe

[BillLee]

rpi xpipe with dinan catback

[playground]

Found this on youtube. A friend's old car

[AlpGolcuklu]

i use İpe and thats the best i think !!

[gouda-buddh]

So from reading everything, I am guessing Akra gives the most gains? Or is it MRF? I hear they have stop producing their stuff.

[tom @ eas]

Originally Posted by gouda-buddh

So from reading everything, I am guessing Akra gives the most gains? Or is it MRF? I hear they have stop producing their stuff.

DLSJ5 makes over 700whp with his VT3 supercharged setup equipped with a Macht Schnell X-Pipe and OEM muffler.

ESS VT3 Supercharged - Update after almost 2 years and 15K miles...
http://www.m3post.com/forums/showthread.php?t=921696

Obviously, no issues with restriction and proven power.

[DLSJ5]

Originally Posted by tom @ eas

DLSJ5 makes over 700whp with his VT3 supercharged setup equipped with a Macht Schnell X-Pipe and OEM muffler.

ESS VT3 Supercharged - Update after almost 2 years and 15K miles...
http://www.m3post.com/forums/showthread.php?t=921696

Obviously, no issues with restriction and proven power.

It made really good power, FWIW is was ~711whp, the MS X pipe also sounded nice paired with the OEM muffler.

[MikeeM3]

Originally Posted by SS1M3

I am in the process of making a decision between these two
1. Fabspeed x pipe with dual resonators for $750 with 15hp and 8ft/lbs gains or
2. AFE XP pipe with dual HFC and dual resonators for $1625 with 18hp and 8ft/lbs gains

To me the least expensive option with desent results is Fabspeed X pipe

usually the x-pipe paired with all other bolt on's and a tune will get you 4-5hp !!!

the most power comes from the catless pipes + tune (30-40hp)

[Blindside_137]

Originally Posted by RoyalFlushness

Meisterschaft GT
Macht Shnell Catless X pipe

Insane! Any drone?

[squartus]

Quick video i did of my ActiveAutowerke Axleback with test pipes, mic was not picking up the deeper notes especially easing out in 1st gear but it gives an idea.

[AlpGolcuklu]

This is my e92 m3. Mods are innotech muffler ( not f1 ) , custom and catless xpipe and y pipe

[chayes11]

my 2008 stock with KSG X-pipe and F1 sound exhaust under load..

open and closed... such a head turner!

[Joe S]

I have a TVS 1740 Harrop Supercharger with an IPE exhaust system that work very well together and sounds exotic!

[maddogm3]

Thank you for compiling all this information. Very useful!

[K_style]

Just installed M Performance Exhaust but it's little too quite...
Does anyone know if changing X pipe makes a huge difference?

I am debating to either sell the exhaust and get a different one or install X pipe.

[Inf4life]

Originally Posted by K_style

Just installed M Performance Exhaust but it's little too quite...
Does anyone know if changing X pipe makes a huge difference?

I am debating to either sell the exhaust and get a different one or install X pipe.

Catless X-pipe should open it up some.

[Jesus E90 M3]

People CORSA is the best exhaust... Zero drone and under hard driving it gives you what u need.
What better system do u need??

[JuttyC]

Originally Posted by Griz

I thought it would be helpful to have a reference thread. This thread was created as a primer, not a one-stop thread, and the burden is still on the buyer to do his/her research. I'll try to keep the first post of this updated... the thread will definitely be a work in progress.

Note: Prices may be off. Some prices are introductory prices, some are estimated prices before production, some are MSRP... I have zero interest in keeping track of prices as they fluctuate (across time and across vendors).

- Please refrain from starting up discussions about specific exhausts.
- Links to the manufacturer/performance line are in blue.
- Links to the primary distributor are in green.

I'd like to keep this as useful as possible. Suggestions, corrections, comments are all helpful.


*Please check out frankzlin79's thread for an outstanding video comparing multiple exhausts:

E9X M3 Exhaust Comparison Video



AC Schnitzer Sport
Discussion Thread
Made in Austria (by Remus)
Price: $3219
Exhaust Type: dual muffler
Construction: stainless steel
Weight:
Claimed Performance Gains:
Video: 1
AC Schnitzer Video: 1 2 DL1

AC Schnitzer Race (aka Export Version)
Discussion Thread
Made in Austria (by Remus)
Price: $3219
Exhaust Type: dual muffler
Construction: stainless steel
Weight:
Claimed Performance Gains:
Video: 1 2
AlpenWhite25 Video: 1

Active Autowerke E9X M3 Signature Exhaust System
Discussion Thread
Price: $2695
Exhaust Type: axle-back dual muffler
Construction: polished 100% 304 stainless steel
Installation: bolt-on
Weight: 41 lbs
Claimed Performance Gains: 12-15 HP ; up to 17+ HP (and 7+ Ft Lbs) with AA programmed software
Video: 1
Pictures:


Active Autowerke E9X M3 Signature X Pipe and Connecting Pipes
Discussion Thread
Price: $1995 (race pipe version); +$1395 for high flow cats
Exhaust Type: header-back mid section with x-pipe (also with high flow cate or race pipe)
Construction: 100% Polished 304 Stainless Steel
Installation: V Band design
Weight: 25 lbs
Claimed Performance Gains: dyno chart
Video (prototype race pipe option with AA muffler): 1
Pictures:


AE Performance Exhaust
Discussion Thread
Price: $1,995
Exhaust Type: axle-back dual muffler
Construction: Full T-304 Stainless Steel Construction
Installation: bolt-on
Weight: 17 Pound Reduction in Weight Over OE System
Claimed Performance Gains:
Video: 1
Pictures:


Agency Power Exhaust System
Discussion Thread
Price: $1,750
Exhaust Type: axle-back dual canister
Construction: T304 stainless steel exhaust
Installation:
Weight:
Claimed Performance Gains: 5hp and 3ft/lbs of torque
Video: 1
Pictures:


Akrapovič Evolution Exhaust System
Discussion Thread
Discussion Thread 2
Price: $5,623
Exhaust Type: header-back dual muffler
Construction: titanium
Weight: 23 kg under stock
Claimed Performance Gains: 24 PS plus; 35 Nm plus
Video: 1
Audio: 1
Pictures:


Akrapovič Slip-on Exhaust System
Discussion Thread
Price:
Exhaust Type: axle-back dual muffler
Construction: titanium
Weight:
Claimed Performance Gains: 3 PS plus; 4 Nm plus
Video:


Amuse Ericsson M480 Titanium Performer Extra
Discussion Thread
Made in Japan
Price:
Exhaust Type: dual muffler
Construction: titanium
Installation: bolt-on
Weight:
Claimed Performance Gains:
Video:
Pictures:


Amuse Ericsson M480 Titanium Performer
Discussion Thread
Made in Japan
Price: $6891
Exhaust Type: axle-back dual muffler
Construction: titanium
Installation: bolt-on
Weight: 29.26 lbs
PencilGeek Performance Gains (full titanium system): +5 HP, +37 TQ link
PencilGeek Video (full titanium system): 1
Socale92 Video (w/ SS mid section): 1
Pictures:


Amuse Ericsson Sports Catalyzer
Made in Japan
Price: $4298
Exhaust Type: header-back mid section with x-pipe
Construction: stainless steel
Installation: bolt-on
Weight: 31.68
Claimed Performance Gains:
Video:

Amuse Ericsson Sports Catalyzer, Titanium
Made in Japan
Price: $6508
Exhaust Type: header-back mid section with x-pipe
Construction: titanium
Installation: bolt-on
Weight: 22.88 lbs
Claimed Performance Gains:
Video:
Pictures:


Arqray Stainless Sport Muffler
Discussion Thread
Made in Japan
Price: $2550
Exhaust Type: dual muffler
Construction: stainless steel
Installation: bolt-on
Weight: 20 kg
Claimed Performance Gains:
Video:
Pictures:


Arqray Titanium Tail
Discussion Thread
Made in Japan
Price:
Exhaust Type:
Construction: stainless steel with titanium
Installation: bolt-on
Weight: 20 kg
Claimed Performance Gains:
Video:
Pictures:


Arqray Titanium Silencer
Discussion Thread
Made in Japan
Price:
Exhaust Type:
Construction: titanium
Installation: bolt-on
Weight: 12.3 kg
Claimed Performance Gains:
Video: 1
Pictures:


B&B Exhaust (prototype)
Discussion Thread
Price: $1695
Exhaust Type: axle-back dual muffler
Construction:
Installation:
Weight: 37 lbs
Claimed Performance Gains:
Video:

Bastuck ClubSport (New Design)
Discussion Thread (Old Design)
Discussion Thread (New Design)
Made in Germany
Price:
Exhaust Type: dual muffler
Construction: stainless steel
Installation: includes flanges for swapping with MotorSport version
Weight:
Claimed Performance Gains:
Video:
Pictures:


Bastuck MotorSport
Discussion Thread
Made in Germany
Price:
Exhaust Type: dual muffler
Construction: stainless steel
Installation: includes flanges for swapping with ClubSport version
Weight: 24 lbs (14 kg)
Claimed Performance Gains: Not tested by Bastuck yet.
Video: 1
Pictures:


BMW Performance Exhaust
Discussion Thread
Price: $3,500.00
Exhaust Type: dual muffler
Construction:
Installation:
Weight: ~20 lb reduction from stock
Claimed Performance Gains:
Video: 1

Borla
Discussion Thread
Price: $1475.99
Exhaust Type: dual muffler
Construction: T-304 stainless steel
Installation: bolt-on
Weight:
Claimed Performance Gains:
Bob@BPS Video: 1
Pictures:


Dinan Free Flow Exhaust
Discussion Thread
Price: $2299
Exhaust Type: muffler
Construction: 304 stainless steel; ceramic-coated tips
Installation:
Weight:
Claimed Performance Gains: 6 hp @ 6800 rpm; 5 lb/ft @ 6800 rpm
Video: 1

Dinan Racing Middle Exhaust
Discussion Thread
Price: $2299.00
Exhaust Type:
Construction:
Installation:
Weight:
Claimed Performance Gains:
Video:
Pictures:


Dixis Spirit
Discussion Thread
Made in Japan
Price: $5400 (MSRP); built to order
Exhaust Type: single muffler
Construction: titanium
Weight: 17.2 lbs
Claimed Performance Gains: 11 HP
Arsenal Video: 1
Pictures:


Eisenmann Sport
Discussion Thread
Discussion Thread 2
Made in Germany
Price: $2839
Exhaust Type: axle-back dual muffler; 83mm tips
Construction: stainless steel
Installation: cut & weld replacement; connecting pipes available
Weight: 46 lbs
Claimed Performance Gains: backpressure reduction of 25% over OEM
Video: 1 2
Pictures:


Eisenmann Race
Discussion Thread
Discussion Thread 2
Made in Germany
Price: $2839
Exhaust Type: axle-back dual muffler
Construction: stainless steel
Installation: cut & weld replacement; connecting pipes available
Weight: 46 lbs
Claimed Performance Gains: backpressure reduction of 32% over OEM; +16hp, +11lb-ft
Video: 1 2 3

Encore Innovation Titanium Exhaust System
Discussion Thread
Price: $2,999 introductory; MSRP: $3,699
Exhaust Type: axle-back dual muffler
Construction: titanium
Weight: 18.55 lbs
Claimed Performance Gains: 7.2 hp, 9.4 ft lbs
Video: 1 2 3 4 5 6 7 8
Pictures:


Encore Innovation M3 X-pipe w/ High Flow Cat
Discussion Thread
Price: $2299
Exhaust Type: header-back mid section with x-pipe and high flow cats (catless version in development)
Construction: 304 stainless steel
Installation:
Weight: 27 lbs
Claimed Performance Gains: 14.7 whp; 20.6 lbs torque
Video:
Pictures:


Encore Innovation Titanium X-Pipe w/ High Flow Cat
Price: $4299
Exhaust Type: mid section
Construction: titanium
Weight: 19 lbs
Claimed Performance Gains:
Video:

Fabspeed Maxflo Muffler System
Discussion Thread
Price: $1,995
Exhaust Type: axle-back dual canister
Construction: T304 stainless steel
Weight: ~17 lb reduction over stock
Claimed Performance Gains:
Video: DL 1
Pictures:


Fabspeed Performance Package with Resonators
Discussion Thread 1
Discussion Thread 2
Price: $2449 (can be purchased in sections)
Exhaust Type: header-back with high-flow primary cats; x pipe
Construction: T304 stainless steel
Weight:
Claimed Performance Gains: 33 whp
Video: 1
Pictures:


Fame Freiheit Exhaust
Discussion Thread
Made in Japan
Price: $3500
Exhaust Type: dual muffler
Construction: SUS304 stainless steel
Weight:
Claimed Performance Gains:
Video: 1 2 3
Pictures:


Fame Freiheit Center Section
Made in Japan
Price:
Exhaust Type: mid section
Construction:
Weight:
Claimed Performance Gains:
Video:
Pictures:


Fujitsubo Zega Exhaust System
Discussion Thread
Price: $3660
Exhaust Type: cat-back dual muffler
Construction: titanium
Weight:
Claimed Performance Gains:
Video: DL
Pictures:


G-Power (discontinued)
Discussion Thread
Price: $2400
Exhaust Type: dual muffler
Construction: stainless steel
Weight:
Claimed Performance Gains:
Video:

Gintani Exhaust System
Discussion Thread
Price: $1995
Exhaust Type: dual muffler
Construction: 304 stainless steel
Weight:
Claimed Performance Gains: 8-12 Horsepower gain
Video: 1 2 3

Gintani Full Exhaust System
Discussion Thread
Price: $3995 (X Pipe Section can be purchased indidivually for $2000)
Exhaust Type: header-back dual muffler
Construction: 304 stainless steel
Weight:
Claimed Performance Gains: 20-30 Horsepower gain
Video: 1 2 3 4 (x-pipe & mufflers)
Pictures:


GruppeM
Discussion Thread
Made in Japan
Price: $4500
Exhaust Type: Sec 2, dual muffler
Construction: titanium
Weight: 20 lbs
Claimed Performance Gains:
GruppeM Video: 1
edlms Video: 1 2
Pictures:


Hamann
Discussion Thread
Made in Italy & Germany
Price:
Exhaust Type: header-to-muffler (metal catalyser as well as a middle section) by Supersprint; dual muffler #1 by Eisenmann (Race Version); dual muffler #2 by Supersprint (Sport/Race Version)
Construction: stainless steel
Weight:
Claimed Performance Gains:
Video: 1 2 3 4
Pictures:


HARTGE Rear Silencer
Price:
Exhaust Type: axle-back single muffler
Construction: stainless steel
Weight:
Claimed Performance Gains:
Video:

HARTGE Exhaust System
Price: £4988
Exhaust Type: header-back single muffler
Construction: stainless steel
Weight:
Claimed Performance Gains: 20 HP
Video:
Pictures:


Herrmann
Discussion Thread
Price:
Exhaust Type:
Construction:
Weight:
Claimed Performance Gains:
LowG Video: 1 2 3 4 5 6

iPE Valvetronic Exhaust System
Discussion Thread
Price:
Exhaust Type: Full exhaust and axle-back options available
Construction: Stainless Steel
Weight:
Claimed Performance Gains:
Video: (see discussion thread for pictures and video)

KKS-Performance
Discussion Thread
Discussion Thread 2
Price: $4199 with butterfly valves ($2699 without)
Exhaust Type: axle-back dual muffler
Construction: stainless steel (optional titanium tips)
Weight: 30% reduction
Claimed Performance Gains: 10 whp
Video: 1 2
Pictures:


Kreis-sieg Valvetronic F1
Discussion Thread
Discussion Thread 2 (Epacy2 Install w Vids)
Discussion Thread 3
Made in Japan
Price: SS tip $5,850; Billet tip $6,350; Ti tip $6,450
Exhaust Type: post-resonator, clamp on dual muffler
Construction: stainless steel (optional titanium tips)
Weight:
Claimed Performance Gains:
Video (w/ X-Pipe): 1 2 3 4 5 6 7 8 9 10 11 12 13
Pictures:


Kreis-sieg Front X-Pipe
Made in Japan
Price: purchase directly
Exhaust Type: header-back mid section with x-pipe; eliminates resonators and cats
Construction: stainless steel
Installation:
Weight:
Claimed Performance Gains:
Video:
Pictures:


Lightweight Titanauspuffanlagen Exhausts
Discussion Thread
Price:
Exhaust Type:
Construction:
Installation:
Weight:
Claimed Performance Gains:
Video:
Pictures:

Magnaflow Performance Exhaust
Discussion Thread
Price: $1,814,86
Exhaust Type: cat-back
Construction: stainless steel
Installation:
Weight:
Claimed Performance Gains: +18hp and +4torque to the wheel
DEAN325i Video: 1 2 3
Pictures:


Megan Racing Axle Back
Discussion Thread
Price: $600.00
Exhaust Type: axle-back
Construction: T-304 Stainless Steel (optional titanium tips)
Installation: bolt-on
Weight:
Claimed Performance Gains:
Video: 1
Pictures:


Mille Miglia Eshaust
Discussion Thread
Price:
Exhaust Type: axle-back dual muffler
Construction:
Installation:
Weight:
Claimed Performance Gains:
Video: 1
Pictures:


Milltek Sport
Discussion Thread 1
Discussion Thread 2
Price: $1699
Exhaust Type: cat-back single muffler
Construction: stainless steel
Installation:
Weight: 48 lbs
Claimed Performance Gains:
Video: 1
Pictures:


MRF Engineering Velaforza Exhaust System
Price:
Exhaust Type: header-back
Construction: Full Stainless Steel SS304, SS321 Construction
Installation:
Weight:
Claimed Performance Gains: 28 RWHP, 22 RWTQ
Video:
Pictures:

Power-Craft Hybrid Exhaust System
Price:
Exhaust Type:
Construction:
Installation:
Weight:
Claimed Performance Gains:
Video: 1
Pictures:

Racing Dynamics Sport
Discussion Thread
Price: $2800
Exhaust Type: axle-back dual muffler
Construction: stainless steel
Installation: bolt-on
Weight:
Claimed Performance Gains: 12 HP
Video: 1
Pictures:


Remus Sport
Discussion Thread
Made in Austria
Price: $1420
Exhaust Type: dual muffler
Construction: stainless steel
Weight: 44 lbs
Claimed Performance Gains: 10 CHP; backpressure reduction of 63% over OEM; TUV/EC approved
Speedtrap Video: 1
Video: 1 2 3
Pictures:


Remus Race
Discussion Thread
Made in Austria
Price: $1420
Exhaust Type: dual muffler
Construction: stainless steel
Weight: 44 lbs
Claimed Performance Gains: 10+ CHP; backpressure reduction of 63+% over OEM; not TUV/EC approved
sfbimmer13 Video: 1 2
ChitownM3 Video: 1

Revinora Exhaust (prototype)
Discussion Thread
Price:
Exhaust Type:
Construction:
Weight:
Claimed Performance Gains:
Oshin02 Video: 1 2 3 4

RGMotorsport Conversion Performance Exhaust System
Price:
Exhaust Type:
Construction: stainless steel
Installation:
Weight:
Claimed Performance Gains: see website
Video:

Rogue Engineering Diablo Sport (prototype)
Discussion Thread
Price:
Exhaust Type:
Construction:
Weight:
Claimed Performance Gains:
Video: 1

Rogue Engineering Diablo Race (prototype)
Discussion Thread
Price:
Exhaust Type:
Construction:
Weight:
Claimed Performance Gains:
Video: 1 2


RPi Axle Back Muffler Assembly
Discussion Thread
Price: $1707.00
Exhaust Type: axle-back dual muffler
Construction:
Weight:
Claimed Performance Gains: 5-10whp
Video:
Pictures:


RPi GT Front Pipe/Cat Delete
Discussion Thread
Price: $1299.00
Exhaust Type: header to axle mid=section
Construction: T-304 stainless steel
Weight:
Claimed Performance Gains:
Video:
Pictures:


Sosi Performance X-Pipe
Discussion Thread
Price: $595.00
Exhaust Type: x-pipe (replaces secondary cats and resonators)
Construction: T304 stainless steel
Weight:
Claimed Performance Gains:
Video: 1
Pictures:


Supersport Duplex Exhaust [Export Version]
Discussion Thread
Price: €* 1.546,94
Exhaust Type:
Construction:
Installation:
Weight:
Claimed Performance Gains:
Video: 1
Pictures:


Supersprint Street
Made in Italy
Price: $2630
Exhaust Type: axle-back single muffler
Installation: needs connecting pipes, Supersprint produces some
Construction: stainless steel
Weight:
Claimed Performance Gains:
Video: 1
Pictures:


Supersprint Sport/Race (Left) (Right)
Discussion Thread
Made in Italy
Price: $1045 (per side)
Exhaust Type: axle-back dual muffler
Installation: needs connecting pipes, Supersprint produces some
Construction: stainless steel
Weight:
Claimed Performance Gains: 27.5 HP (for full header-back race)
kosh Video: 1 2
Pictures:


Supersprint X Pipe
Discussion Thread
Made in Italy
Price: $683
Exhaust Type: resonator replacement
Construction: stainless steel
Weight:
Claimed Performance Gains:
Video:
Pictures:


Supersprint Header-back Mid Section
Made in Italy
Price:
Exhaust Type: header-back mid section with x-pipe (only available through Hamann)
Construction:
Weight:
Claimed Performance Gains:
Video:

Tubi Style
Discussion Thread
Made in Italy
Price: $3440
Exhaust Type: dual muffler
Construction: stainless steel
Installation: clamp-on mufflers
Weight: 42 lbs
Claimed Performance Gains:
Video: 1 2 3
Pictures:


UUC Motorwerks RSC (by Corsa)
Discussion Thread
Made in USA
Price: $1599
Exhaust Type: dual muffler
Construction: 2.5” 304SS tubing
Installation: bolt-on
Weight: 30% weight reduction
Claimed Performance Gains:
Video: 1
fuzzy123 Video: 1 2 3 4 5
Pictures:


Vanguard Performance Titanium Exhaust
Discussion Thread
Price: $3199
Exhaust Type: dual muffler
Construction: titanium
Weight: < 19 lbs
Claimed Performance Gains: 13whp, 6ft/lbs tq
Video: 1

Vanquish Hyper Tornado Mufflers
Made in Japan
Price: JPY 398,000, Cash Retail: JPY 355,950
Exhaust Type: dual muffler
Construction: stainless steel with Iconel (titanium alloy) tips
Weight:
Claimed Performance Gains: preserved low end torque
Video: 1

Vorsteiner
Discussion Thread 1
Discussion Thread 2
Price: $3499
Exhaust Type: single muffler, rear section, x pipe
Construction: titanium
Installation: bolt-on
Weight: 17.33 lbs (37 lbs savings)
Claimed Performance Gains: peak HP gain= 14hp, peak torque gain= 13.23 lb/ft
Vorsteiner Video: 1
badfish Video: 1 2 3
Video: 1
Pictures:


X-OST Maranello Exhaust
Discussion Thread
Price: $2699
Exhaust Type: axle-back dual muffler
Construction: 2 sound levels; optional carbon fiber tips
Installation: clamp
Weight:
Claimed Performance Gains:
Video: 1
Pictures:


Other
Amuse Ericsson headers
ASR Engineering Exhaust
ASR Engineering Full Exhaust
Autobahn Exotics Race (development)
Borla X-Pipe With Test Pipes and Resonators
BlueWave Engineering Mufflers (development)
GT Haus (Eisenhaus), multiple exhausts
RD Sport headers (stroker & stock applications)
Riss Racing Exhaust
Riss Racing X-Pipe Section Exhaust

This is an excellent consolidated offering. Can someone please point me in the right direction here. I have a 2011 M3 with Competition package ( minus performance exhaust ).

I want to add better sound, torque and HP. I was going to add a Sosi X pipe and delete the secondary cats. To provide more torque and HP. Additionally, I was going to add intake to increase / support torque and HP.

Is this the best bang for my dollar? Will I have any type of smell from adding X pipe and deleting secondary cats?

Suggestions?

[81bear]

Originally Posted by JuttyC

This is an excellent consolidated offering. Can someone please point me in the right direction here. I have a 2011 M3 with Competition package ( minus performance exhaust ).

I want to add better sound, torque and HP. I was going to add a Sosi X pipe and delete the secondary cats. To provide more torque and HP. Additionally, I was going to add intake to increase / support torque and HP.

Is this the best bang for my dollar? Will I have any type of smell from adding X pipe and deleting secondary cats?

Suggestions?

Best bang for your buck would probably be test pipes and a tune. You really need to reduce the restriction in the primary cats to free up the extra power and it should give you a bit more volume to the exhaust note, but I'm not sure on that.