Exhaust Modification (inspired by Periokid/Subw00er)

Donbona · 07-06-2010, 10:36 AM

Sounds pretty good.. cost????

URG8RB8 · 12-30-2010, 06:43 AM

I have an appointment set up, in a few days, with a local performance shop. I just can't decide whether or not to replace the insulation. What did you end up doing with the poodle that lived in your muffler? What are your thoughts on this?

ee8 · 12-30-2010, 08:39 AM

I put it inside again and so did most people with this mod... and trust me it is the way to go... if after the mod you still want more pep just do the secondary cat delete mod, too.

WCM3 · 12-30-2010, 09:35 AM

Sounds great dude. I'm definitely looking into doing this. Do you have a picture of the inside of the exhaust before you welded it all up?

elp_jc · 12-30-2010, 04:33 PM

I might be in the minority here, but I like the stock exhaust best on tone. I definitely like it best inside without a doubt. On the outside, I'd like it a bit more vocal, sure, but not at the expense of raspiness, 'motorboating', higher pitch, or any of the other undesirable (to me

) tone side effects of opening up the exhaust. So far there's nothing I'd put in my car even if free.

By the way, this is the first video I hear where you can truly appreciate the stock exhaust, since most are only at WOT. Thanks man

.

URG8RB8 · 01-03-2011, 07:53 PM

Update - I had my stock exhaust modded today, with welded tubes in place of the large perforated ones. I figured that, since the exhaust was already off the car, I would have the secondary cats replaced with 3" stainless tubing. Mistake. Holy crap, is this thing loud! Even though I left the resonators in place, it's too raspy for my taste. Now, it's back to the shop to get the cats back on. Live and learn.

WCM3 · 01-04-2011, 03:15 PM

Quote:

Originally Posted by URG8RB8

Update - I had my stock exhaust modded today, with welded tubes in place of the large perforated ones. I figured that, since the exhaust was already off the car, I would have the secondary cats replaced with 3" stainless tubing. Mistake. Holy crap, is this thing loud! Even though I left the resonators in place, it's too raspy for my taste. Now, it's back to the shop to get the cats back on. Live and learn.

I wonder if the rasp is from the cat delete. Report back once you get the cats installed. Ok?

URG8RB8 · 01-04-2011, 09:07 PM

Getting the cats back in place on Thursday. I'll give an update then. I hope that's what is making it sound that way. I never got the impression that the "Periokid" mod would make the car sound like it should live on a track - just give it a little more grunt.

*** UPDATE ***
Got the secondary cats back in. Perfect! If anyone in this thread wants a perfect balance between beautiful noises that come from under the hood and the unmistakably BMW exhaust note - this exhaust modification is what you need. Removing the secondary cats, while nice sounding, is very exhaust-heavy and sounds like it is a track car - a little too "notice me" for my tastes.

For anyone interested, I can the top of the cans cut open, and the larger perforated tubes replaced with S/S tubing. The steel wool was left on the smaller perforations, and the insulation was re-stuffed into the cans. My local shop did a great job with the welds, so there are no welds visible from the back of the car. For those wondering about price, the entire work would have cost me $400, assuming I didn't take out/place back the secondary cats. The sound is amazing! No drone, but the sound is mean under moderate and heavy acceleration. I would easily recommend this mod for those who want a little more exhaust grunt without being too obnoxious.

8_is_enough · 09-05-2011, 01:58 PM

Quote:

Originally Posted by VictorH

Very nice results.
So to clarify the modification did you:
1) Replace the completely perforated pipe with a solid pipe (welded in)
2) Leave the partially perforated pipe alone
3) Put the glass fiber insulation back in

Sounds great, not too loud but with a nice sound.

bump, interested in knowing this too

smmmurf · 09-05-2011, 02:56 PM

Cost was under $300 including installation at Exhaust Works in Belmont, CA - highly recommended.

Glad you guys like the sound.

8_is_enough · 09-05-2011, 08:22 PM

Quote:

Originally Posted by smmmurf

Cost was under $300 including installation at Exhaust Works in Belmont, CA - highly recommended.

Glad you guys like the sound.

sweet, that's local also

thanks!

smmmurf · 09-06-2011, 01:06 PM

Quote:

Originally Posted by rclee337

sweet, that's local also

thanks!

Tell Todd that Sean sent you!

8_is_enough · 09-06-2011, 01:17 PM

Quote:

Originally Posted by smmmurf

Tell Todd that Sean sent you!

will do, thanks!

ksflatlander · 02-25-2012, 11:27 AM

Does it make a difference if you leave the steel wool around the smaller perforations vs taking it off? I know Periokid took it out.

///Mikey · 03-02-2012, 03:12 PM

Sounds soooooo good!

TanDaMan · 04-04-2012, 01:25 AM

Nice! Gonna get mine done this wkend. can't wait!

ashtaron14 · 04-04-2012, 11:02 PM

I'm wondering, so even if you don't step on it, like the drive by in the beginning, it's still going to have a lot more noise now right?

ksflatlander · 04-07-2012, 08:07 AM

No. At warm idle and under light load it sounds stock.

1MOREMOD · 04-07-2012, 08:25 AM

sounds good. keep that M button on.

Subw00er · 10-02-2013, 02:42 PM

Just found this thread.. sorry for digging it up, but wanted to say thanks for the kudos.. not many know where these e92 exhaust mods came from!

Sounds great!

///M Power-Belgium · 10-02-2013, 02:52 PM

Quote:

Originally Posted by Subw00er

Just found this thread.. sorry for digging it up, but wanted to say thanks for the kudos.. not many know where these e92 exhaust mods came from!

Sounds great!

Subw00er i need to say...thank you man,you was the first i saw(back in time) with the study of the Oem.exhaust mod and the explanation of the Helmholtz chamber....

man !
So check this out >>>

http://www.m3post.com/forums/showthread.php?t=733817
Again...THX man i realy love it...every single day

Subw00er · 10-02-2013, 04:20 PM

Cool, nice writeup!

07-06-2010, 10:36 AM	#23
Donbona Lieutenant Colonel Drives: E93 M3 DCT 2008 Join Date: May 2009 Location: London UK Posts: 1,655 iTrader: (0)	Sounds pretty good.. cost???? __________________ M3 E93 DCT, Space Grey,BC HB29 Forged Deep Concave Wheels, Ericsson Amuse F/R Bumper, Evolve Full Exhaust System, INTRAX Coilovers, STOPTECH BBK, Performance Steering Wheel,Custom Red/Black Leather Seats,Evolve Supercharger ///M3 \|\|Bimmerpost M3 Car Of The Month May - 2010SOLD 2010 R35 GTR
	0

12-30-2010, 09:35 AM	#26
WCM3 Î canŧ főcus mŷ attėntĭon Drives: S5 & M3t Join Date: May 2008 Location: Downingtown, Pa Posts: 1,221 iTrader: (6)	Sounds great dude. I'm definitely looking into doing this. Do you have a picture of the inside of the exhaust before you welded it all up? __________________ 1995 M3 Coupe - Avus/Hurricane, AEM EMS, Precision Turbo, Boostlogic, H&R, Fikse FM/5, MaxVelocity, Maximum PSI, 20% Tint, etc etc.. 2009 M3 Coupe - AW/Fox Red, 6MT, Carbon Roof, Shadow Trim, etc (Sold) 2007 335i Coupe - JB3, 6MT, UR Intake, H&R Springs, Gunmetal VMR V710, Aero Lip, Carbon Trim, etc (Sold)
	0

01-04-2011, 09:07 PM	#30
URG8RB8 Private Drives: '10 E90 M3 6MT Join Date: Nov 2010 Location: South Florida Posts: 80 iTrader: (0)	Getting the cats back in place on Thursday. I'll give an update then. I hope that's what is making it sound that way. I never got the impression that the "Periokid" mod would make the car sound like it should live on a track - just give it a little more grunt. * UPDATE * Got the secondary cats back in. Perfect! If anyone in this thread wants a perfect balance between beautiful noises that come from under the hood and the unmistakably BMW exhaust note - this exhaust modification is what you need. Removing the secondary cats, while nice sounding, is very exhaust-heavy and sounds like it is a track car - a little too "notice me" for my tastes. For anyone interested, I can the top of the cans cut open, and the larger perforated tubes replaced with S/S tubing. The steel wool was left on the smaller perforations, and the insulation was re-stuffed into the cans. My local shop did a great job with the welds, so there are no welds visible from the back of the car. For those wondering about price, the entire work would have cost me $400, assuming I didn't take out/place back the secondary cats. The sound is amazing! No drone, but the sound is mean under moderate and heavy acceleration. I would easily recommend this mod for those who want a little more exhaust grunt without being too obnoxious. Last edited by URG8RB8; 01-10-2011 at 01:31 PM. Reason: UPDATE
	0

09-05-2011, 02:56 PM	#32
smmmurf Colonel Drives: 2009 M3 Sedan 6MT Join Date: Feb 2008 Location: Pleasanton, CA Posts: 2,081 iTrader: (7)	Cost was under $300 including installation at Exhaust Works in Belmont, CA - highly recommended. Glad you guys like the sound. __________________ M3 Sedan LCI - AW/Black - 6MT - no moonroof - no folding seats - RAC RG63 - clear bra by Omega Werks
	0

04-04-2012, 11:02 PM	#39
ashtaron14 First Lieutenant Drives: E90 M3 6MT Join Date: Jun 2011 Location: HK Posts: 328 iTrader: (0)	I'm wondering, so even if you don't step on it, like the drive by in the beginning, it's still going to have a lot more noise now right? __________________
	0

12-30-2010, 06:43 AM	#24
URG8RB8 Private Drives: '10 E90 M3 6MT Join Date: Nov 2010 Location: South Florida Posts: 80 iTrader: (0)	I have an appointment set up, in a few days, with a local performance shop. I just can't decide whether or not to replace the insulation. What did you end up doing with the poodle that lived in your muffler? What are your thoughts on this?
	0

12-30-2010, 08:39 AM	#25
ee8 Private First Class Drives: E92 M3 Join Date: Oct 2009 Location: Portugal Posts: 148 iTrader: (0) Garage List 2008 BMW M3 [3.20]	I put it inside again and so did most people with this mod... and trust me it is the way to go... if after the mod you still want more pep just do the secondary cat delete mod, too.
	0

12-30-2010, 04:33 PM	#27
elp_jc Brigadier General Drives: . Join Date: May 2008 Location: . Posts: 4,910 iTrader: (0)	I might be in the minority here, but I like the stock exhaust best on tone. I definitely like it best inside without a doubt. On the outside, I'd like it a bit more vocal, sure, but not at the expense of raspiness, 'motorboating', higher pitch, or any of the other undesirable (to me ) tone side effects of opening up the exhaust. So far there's nothing I'd put in my car even if free. By the way, this is the first video I hear where you can truly appreciate the stock exhaust, since most are only at WOT. Thanks man .
	0

01-03-2011, 07:53 PM	#28
URG8RB8 Private Drives: '10 E90 M3 6MT Join Date: Nov 2010 Location: South Florida Posts: 80 iTrader: (0)	Update - I had my stock exhaust modded today, with welded tubes in place of the large perforated ones. I figured that, since the exhaust was already off the car, I would have the secondary cats replaced with 3" stainless tubing. Mistake. Holy crap, is this thing loud! Even though I left the resonators in place, it's too raspy for my taste. Now, it's back to the shop to get the cats back on. Live and learn.
	0

02-25-2012, 11:27 AM	#36
ksflatlander Second Lieutenant Drives: 2011 E90 M3 Join Date: Feb 2012 Location: Lawrence, KS Posts: 263 iTrader: (0)	Does it make a difference if you leave the steel wool around the smaller perforations vs taking it off? I know Periokid took it out.
	0

03-02-2012, 03:12 PM	#37
///Mikey New Member Drives: 2005 MINI Cooper S Join Date: Oct 2011 Location: Indiana Posts: 5 iTrader: (0)	Sounds soooooo good!
	0

04-04-2012, 01:25 AM	#38
TanDaMan Enlisted Member Drives: BMW M3 E90 Join Date: Apr 2012 Location: Michigan Posts: 43 iTrader: (1)	Nice! Gonna get mine done this wkend. can't wait!
	0

04-07-2012, 08:07 AM	#40
ksflatlander Second Lieutenant Drives: 2011 E90 M3 Join Date: Feb 2012 Location: Lawrence, KS Posts: 263 iTrader: (0)	No. At warm idle and under light load it sounds stock. __________________ . 2011 E90, Melbourne Red, Bamboo, DCT, Premium, Comfort, Cold, Enhanced Stereo, Apps "I don't drive fast, I just fly low."
	0

04-07-2012, 08:25 AM	#41
1MOREMOD 2014 Track Days - 6\|Ridge 1:54:61\|Pacific 1:35:72 Drives: Race car-> Join Date: Mar 2009 Location: check your mirrors Posts: 11,607 iTrader: (5)	sounds good. keep that M button on. __________________ 02 Tiag e46 M3\|6MT\|GC plates\|MCS c.o.\|GC bars\|GC race control arms\|GC bushings & bearings\|BW eng. & tran. mounts\|subframe kit\|BW race shifter\|BW Jaffster\|Euro header\|BW race\|K&N c.a.i.\|Epic race tune\|Rouge pulleys\|Seibon CF hood\|CSL bumper\|ST-40\|XR-2\|SS lines\|half cage\|Recaro profi\|Profi 2 harness\|BMWpedals\|BW studs\|
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10-02-2013, 02:42 PM	#42
Subw00er Bates '08 Interlagos Launch Drives: 08e92M, 03e46M Join Date: Nov 2005 Location: NY Posts: 1,202 iTrader: (2)	Just found this thread.. sorry for digging it up, but wanted to say thanks for the kudos.. not many know where these e92 exhaust mods came from! Sounds great! __________________ Custom Exhaust Project: Bates Valvetronic exhaust: http://www.m3post.com/forums/showthread.php?t=253661 -- Exhaust Mod pics in here: http://www.flickr.com/photos/40236795@N03/ DON'T BUY Race Ready Performance electronic cutout valves. Here's why: http://www.m3post.com/forums/showthr...40#post9589740
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10-02-2013, 04:20 PM	#44
Subw00er Bates '08 Interlagos Launch Drives: 08e92M, 03e46M Join Date: Nov 2005 Location: NY Posts: 1,202 iTrader: (2)	Cool, nice writeup! __________________ Custom Exhaust Project: Bates Valvetronic exhaust: http://www.m3post.com/forums/showthread.php?t=253661 -- Exhaust Mod pics in here: http://www.flickr.com/photos/40236795@N03/ DON'T BUY Race Ready Performance electronic cutout valves. Here's why: http://www.m3post.com/forums/showthr...40#post9589740
	0

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