Which Exhaust Setup Gives You The Most Gains?

d_dot · 04-17-2009, 12:59 PM

I dont care about the money. and im not worried about emissions. i also dont really want the check engine light coming on either. I wanna go catless and want a system from the end of the headers all the way back. which setup will give me the most hp / tq gains???? thx in adv

camaross305 · 04-17-2009, 01:42 PM

I would say AA catless x pipe, their software, and their exhaust. They are one of the few that have dynos for their exhaust alone. I want to say it was about a 14hp increase for just the catback. Regardless of what brand x pipe/mid pipe setup you get if you delete the primary cats your going to have to get the car tuned in order to avoid not having a check engine light.

dogears · 04-17-2009, 01:47 PM

Excellent choice, AA. Pricey but good.

Fabspeeds dynos are just as good btw. 15hp for their Xpipe. Priced at $625 as well.

Quote:

Originally Posted by camaross305

I would say AA catless x pipe, their software, and their exhaust. They are one of the few that have dynos for their exhaust alone. I want to say it was about a 14hp increase for just the catback. Regardless of what brand x pipe/mid pipe setup you get if you delete the primary cats your going to have to get the car tuned in order to avoid not having a check engine light.

dmerk1978 · 04-17-2009, 02:05 PM

rpi gt exhaust 28hp legit

d_dot · 04-17-2009, 02:16 PM

Quote:

Originally Posted by dmerk1978

rpi gt exhaust 28hp legit

with out cats or with cats?

Checkcaptain · 04-17-2009, 02:19 PM

Quote:

Originally Posted by camaross305

I would say AA catless x pipe, their software, and their exhaust. They are one of the few that have dynos for their exhaust alone. I want to say it was about a 14hp increase for just the catback. Regardless of what brand x pipe/mid pipe setup you get if you delete the primary cats your going to have to get the car tuned in order to avoid not having a check engine light.

Akrapovic TI evolution system!

d_dot · 04-17-2009, 02:20 PM

whats the hp gains on the Akrapovic TI evolution system?

Checkcaptain · 04-17-2009, 02:44 PM

Quote:

Originally Posted by d_dot

whats the hp gains on the Akrapovic TI evolution system?

Here it comes:

dogears · 04-17-2009, 02:49 PM

That is beautiful!

But it requires a tune to prevent CEL.....

Quote:

Originally Posted by Checkcaptain

Here it comes:

Checkcaptain · 04-17-2009, 02:58 PM

Negative - it comes with Lambda adaptors!

Quote:

Originally Posted by dogears

That is beautiful!

But it requires a tune to prevent CEL.....

dmerk1978 · 04-17-2009, 03:10 PM

Quote:

Originally Posted by d_dot

with out cats or with cats?

cat delete

http://www.m3post.com/forums/showthr...=236430&page=9

naveenb · 04-17-2009, 03:29 PM

if money is no object the aa and the Akrapovic systems are looking good on numbers. if money has to be budgeted the rpi system has to be on the top of the list.

dogears · 04-17-2009, 04:03 PM

So you move the O2 past those rear cats?? And the 100 cell doesn't code?

Quote:

Originally Posted by Checkcaptain

Negative - it comes with Lambda adaptors!

dmerk1978 · 04-17-2009, 04:37 PM

Quote:

Originally Posted by naveenb

if money is no object the aa and the Akrapovic systems are looking good on numbers. if money has to be budgeted the rpi system has to be on the top of the list.

the Akrapovic quotes 24hp, and the rpi quotes 28hp, so if the O.P. is looking for straight gains why wouldn't he go with the RPI system...am i missing something?

d_dot · 04-17-2009, 05:35 PM

Quote:

Originally Posted by Checkcaptain

Akrapovic TI evolution system!

damn thats a sexy exhaust. sorry bout asking for the hp numbers i was at work earlier and the pics most of the time dont show up. i see i asked for the numbers like an idiot. but thx now where can i get one of them and if its 24hp do u kjnow how much it would be with no cats?

d_dot · 04-17-2009, 06:08 PM

another quick question if i get a cat delete x pipe from fab speed will it hook up directly to rpi cat back just curious since they are fairly local?

dogears · 04-17-2009, 07:04 PM

Because a difference of 4hp measured on different dynos and different cars is insignificant. Plus the Akrapovic has cats and resonators. The RPI doesn't. Therefore, if we are to split hairs, the Akrapovic is clearly superior.

I stand by the comment that any well designed exhaust will net about the same gains. It is not rocket science.

Quote:

Originally Posted by dmerk1978

the Akrapovic quotes 24hp, and the rpi quotes 28hp, so if the O.P. is looking for straight gains why wouldn't he go with the RPI system...am i missing something?

J08M3 · 04-17-2009, 08:06 PM

Quote:

Originally Posted by dogears

I stand by the comment that any well designed exhaust will net about the same gains. It is not rocket science.

+1.. My feeling is the biggest changes in dyno numbers have to do with the person conducting the dyno runs.

Any properly designed system will have very little restriction and all offer about the same HP gain. The real trick is doing that plus coming up with a nice sound and no drone at the same time.

Sales@Evolve · 04-18-2009, 12:48 AM

The Akrapovic dyno graph looks 100% legit. All correction factors, run down losses etc are very consistent and it's a realistic gain.

Same goes with the Active Autowerke system, very realistic figures and again top quality.

As a package the Active Autowerke system in unbeatable with it's excellent and thoroughly tested software.

mikewads · 04-18-2009, 07:52 AM

The Akrapovic system is also made out of titanium which means its much lighter.

Quote:

Originally Posted by dogears

Because a difference of 4hp measured on different dynos and different cars is insignificant. Plus the Akrapovic has cats and resonators. The RPI doesn't. Therefore, if we are to split hairs, the Akrapovic is clearly superior.

I stand by the comment that any well designed exhaust will net about the same gains. It is not rocket science.

Quote:

Originally Posted by dmerk1978

the Akrapovic quotes 24hp, and the rpi quotes 28hp, so if the O.P. is looking for straight gains why wouldn't he go with the RPI system...am i missing something?

Akara1 · 04-18-2009, 10:04 AM

Quote:

Originally Posted by mikewads

The Akrapovic system is also made out of titanium which means its much lighter.

Mine should be here tuesday.

d_dot · 04-18-2009, 12:35 PM

Quote:

Originally Posted by mikewads

The Akrapovic system is also made out of titanium which means its much lighter.

is that the main difference between stainless steel and titanium the weight savings? or can one provide more hp gains some how?

04-17-2009, 12:59 PM	#1
d_dot 4 * General 56 Rep 644 Posts Drives: F12 M6,Audi R8 Lambo Gallardo Join Date: Dec 2007 Location: Tri-State iTrader: (0)	Which Exhaust Setup Gives You The Most Gains? I dont care about the money. and im not worried about emissions. i also dont really want the check engine light coming on either. I wanna go catless and want a system from the end of the headers all the way back. which setup will give me the most hp / tq gains???? thx in adv __________________ Nissan GT-R (Sold) E92 M3 + 335 (sold) F10 535 (sold) When Driving Nice Whips It Helps To Have Nice Kix!
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04-17-2009, 01:42 PM	#2
camaross305 135 Rep 1,825 Posts Drives: 2008 M3 Join Date: Jul 2008 Location: gainesville fl iTrader: (20)	I would say AA catless x pipe, their software, and their exhaust. They are one of the few that have dynos for their exhaust alone. I want to say it was about a 14hp increase for just the catback. Regardless of what brand x pipe/mid pipe setup you get if you delete the primary cats your going to have to get the car tuned in order to avoid not having a check engine light.
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04-17-2009, 02:05 PM	#4
dmerk1978 First Lieutenant 23 Rep 315 Posts Drives: e 90 m3 sedan aw Join Date: Dec 2008 Location: long beach, ca iTrader: (0) Garage List 2009 red bad ass wagon [10.00] 2008 E90 [0.00] 2007 Denali [0.00] 2006 550i [0.00] 2004 clk 500 [0.00]	rpi gt exhaust 28hp legit
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04-17-2009, 02:20 PM	#7
d_dot 4 * General 56 Rep 644 Posts Drives: F12 M6,Audi R8 Lambo Gallardo Join Date: Dec 2007 Location: Tri-State iTrader: (0)	whats the hp gains on the Akrapovic TI evolution system? __________________ Nissan GT-R (Sold) E92 M3 + 335 (sold) F10 535 (sold) When Driving Nice Whips It Helps To Have Nice Kix!
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04-17-2009, 03:29 PM	#12
naveenb Private First Class 13 Rep 114 Posts Drives: nothing yet... Join Date: Jan 2009 Location: cali...ftw! iTrader: (0)	if money is no object the aa and the Akrapovic systems are looking good on numbers. if money has to be budgeted the rpi system has to be on the top of the list. __________________ Naveen WANTED: Audi S4<Audi S5<BMW M3 sedan<Audi RS5
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04-17-2009, 06:08 PM	#16
d_dot 4 * General 56 Rep 644 Posts Drives: F12 M6,Audi R8 Lambo Gallardo Join Date: Dec 2007 Location: Tri-State iTrader: (0)	another quick question if i get a cat delete x pipe from fab speed will it hook up directly to rpi cat back just curious since they are fairly local? __________________ Nissan GT-R (Sold) E92 M3 + 335 (sold) F10 535 (sold) When Driving Nice Whips It Helps To Have Nice Kix!
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04-18-2009, 12:48 AM	#19
Sales@Evolve BimmerPost Supporting Vendor 92 Rep 1,064 Posts Drives: Slow Join Date: Feb 2008 Location: Luton, Bedfordshire iTrader: (0)	The Akrapovic dyno graph looks 100% legit. All correction factors, run down losses etc are very consistent and it's a realistic gain. Same goes with the Active Autowerke system, very realistic figures and again top quality. As a package the Active Autowerke system in unbeatable with it's excellent and thoroughly tested software.
	Appreciate 0 Quote