any hp gained from exhaust

Kristipela · 07-27-2014, 12:05 AM

Exhaust is one of the last few things I need to be done to my car. A lot of threads talk about not even bothering to do a exhaust since there is few gains coming from it. I have all the other bolt ons for the car and my sponsor shop is setting me up a pro tune date for the car soon so pretty much wondered if it was going to make a big difference or not spending 1k on a exhaust. I would either just buy a exhaust or just mod the stock exhaust. Let me know what you guys think.

135Pats · 07-27-2014, 12:07 AM

On a FBO stock frame car we're talking IDK...5-10WHP to be gained aft of the downpipes? That's a guess on my part but bottom line is it's not a major area to pick up power. And that would be midpipes+axle back decatted.

Once you really starting cranking up the boost (single turbo) then it becomes appreciably more important to ditch the factory system. The mid cats in particular become a bottle neck and some legitimate gains can be picked up in that regard.

Kristipela · 07-27-2014, 12:11 AM

Quote:

Originally Posted by 135Pats

On a FBO stock frame car we're talking IDK...5-10WHP to be gained aft of the downpipes? That's a guess on my part but bottom line is it's not a major area to pick up power. And that would be midpipes+axle back decatted.

Once you really starting cranking up the boost (single turbo) then it becomes appreciably more important to ditch the factory system. The mid cats in particular become a bottle neck and some legitimate gains can be picked up in that regard.

thats pretty much what I've been reading on it, i just don't want to spend a grand for 5-10 awhp. When i can just mod the stock exhaust to sound pretty mean.

pwr hungry · 07-27-2014, 12:12 AM

Exhaust is more a sound mod than anything on these cars.

Kristipela · 07-27-2014, 12:16 AM

Quote:

Originally Posted by pwr hungry

Exhaust is more a sound mod than anything on these cars.

thats what i figured. The goal is to a least get 420awhp on the protune. So wasn't sure how much the exhaust would help me or not

Pr335bob · 07-27-2014, 04:23 AM

It won't help that muc, I wouldn't waste 1500 on an exhaust to get 5whp maybe and sound cooler? Nope. Now the only benefit I see is maybe the weight saving. some exhaust like the vrsf among others claim 30-40 pounds ir I'm not mistaken. That's the only real benefit I think is worth mentioning or rather asking when purchasing an exhaust. How much weight am I going to shed vs stock?

ihc95 · 07-27-2014, 07:36 AM

It's not a huge power adder but Grassroots Motorsports did a comparo of a bunch of exhausts and the HKS gained 13whp over stock. On a tuned/bolt-on car I'd imagine the gains would be more around 15-20whp. Not a ton but still decent imo.

http://grassrootsmotorsports.com/art...ive-decisions/

jeeve.x · 07-27-2014, 10:36 AM

Quote:

Originally Posted by ihc95

It's not a huge power adder but Grassroots Motorsports did a comparo of a bunch of exhausts and the HKS gained 13whp over stock. On a tuned/bolt-on car I'd imagine the gains would be more around 15-20whp. Not a ton but still decent imo.

http://grassrootsmotorsports.com/art...ive-decisions/

Nice find.

Transport3r · 07-27-2014, 11:39 AM

Does anyone still sell that HKS exhaust? it seems like all i can find is the legamax which doesn't seem to have the H pipe...

_ink · 07-27-2014, 06:47 PM

Any RB'ers out there that have tested this with the upgrade?

Eat.Sleep.Race · 07-27-2014, 07:36 PM

Get the M2 exhaust, its actually really quality piece, a lot of people have had them for years with no issues, and it sounds great. I think better than almost all 1K$$ plus systems do..

http://www.ebay.com/itm/M2-BMW-E92-3...7c2eab&vxp=mtr

Beau93315 · 07-27-2014, 07:47 PM

Quote:

Originally Posted by 135Pats

Once you really starting cranking up the boost (single turbo) then it becomes appreciably more important to ditch the factory system. The mid cats in particular become a bottle neck and some legitimate gains can be picked up in that regard.

This, I was being restricted power wise until I upgraded my exhaust to VRSF not only does it sound beautiful WOT, it lets me make moar

.

Kristipela · 07-27-2014, 08:02 PM

Quote:

Originally Posted by Eat.Sleep.Race

Get the M2 exhaust, its actually really quality piece, a lot of people have had them for years with no issues, and it sounds great. I think better than almost all 1K$$ plus systems do..

http://www.ebay.com/itm/M2-BMW-E92-3...7c2eab&vxp=mtr

the only thing that considered me about that exhaust was i have no idea how it would sound with downpipes. Guess i should go hit up youtube. lol

Eat.Sleep.Race · 07-27-2014, 08:17 PM

Quote:

Originally Posted by Kristipela

the only thing that considered me about that exhaust was i have no idea how it would sound with downpipes. Guess i should go hit up youtube. lol

I have a video on youtube with 3 inch downpipes on mine. sounds really good, ill post the link for you in 2 min when i find it.

Eat.Sleep.Race · 07-27-2014, 08:19 PM

Here it is:

Kristipela · 07-27-2014, 08:19 PM

Quote:

Originally Posted by Eat.Sleep.Race

I have a video on youtube with 3 inch downpipes on mine. sounds really good, ill post the link for you in 2 min when i find it.

Perfect! there isn't any rapsyness from the exhaust with downpipes? Just don't want the car sounding like a honda

Eat.Sleep.Race · 07-27-2014, 08:24 PM

Quote:

Originally Posted by Kristipela

Perfect! there isn't any rapsyness from the exhaust with downpipes? Just don't want the car sounding like a honda

Posted the video, right below i don't have any rasp for sure in person it sounds even better!

Kristipela · 07-27-2014, 08:26 PM

Quote:

Originally Posted by Eat.Sleep.Race

Posted the video, right below i don't have any rasp for sure in person it sounds even better!

the car sounds great in the video for sure, just asking since sometimes a video doesn't beat hearing it in person and in the cabin . Did you have to adjust the exhaust in anyway since the link is for a e92

Eat.Sleep.Race · 07-27-2014, 08:28 PM

Quote:

Originally Posted by Kristipela

the car sounds great in the video for sure, just asking since sometimes a video doesn't beat hearing it in person and in the cabin . Did you have to adjust the exhaust in anyway since the link is for a e92

No i bought the E90 version w/burnt tips. (Same company but adjusted the length of tips and are burnt look rather than stainless.

Same exhaust system tho!

Kristipela · 07-27-2014, 08:36 PM

Quote:

Originally Posted by Eat.Sleep.Race

No i bought the E90 version w/burnt tips. (Same company but adjusted the length of tips and are burnt look rather than stainless.

Same exhaust system tho!

last question would be is would it matter if i have a xi with that exhaust ?

4doorbmwpower · 07-27-2014, 08:39 PM

i wish i did a before and after dyno of my HPF gen2 addition. it is 35 lbs to the 78lb stock system and i SWEAR i could feel a difference but its all speculation. However i will note it cuts out mid pipes and mufflers and is a MASSIVE 3.5 inch ID exhaust. BEASTLY as all hell. I could see this flowing ST hp numbers EASSSSSY

Eat.Sleep.Race · 07-27-2014, 08:50 PM

Quote:

Originally Posted by Kristipela

last question would be is would it matter if i have a xi with that exhaust ?

I believe it is the same, would have to double check or hopefully someone will chime in, it doesn't go anywhere near front axles etc.. so i think it would work. Maybe call a performance shop that sells any 335i exhaust since they will know if it fits both I, and XI.

07-27-2014, 12:05 AM	#1
Kristipela kpela 21 Rep 349 Posts Drives: 2008 335xi Join Date: Feb 2014 Location: Middlebury, Ct iTrader: (2)	any hp gained from exhaust Exhaust is one of the last few things I need to be done to my car. A lot of threads talk about not even bothering to do a exhaust since there is few gains coming from it. I have all the other bolt ons for the car and my sponsor shop is setting me up a pro tune date for the car soon so pretty much wondered if it was going to make a big difference or not spending 1k on a exhaust. I would either just buy a exhaust or just mod the stock exhaust. Let me know what you guys think. __________________ 2008 335xi - LCI conversion - Satin Pearl White Wrap - Oss custom headlights - JB4 - (VRSF downpipes - Exhuast- Intercooler) - AA BOV - AFE Intake - Accuair E-Level Suspension - Forgestar F14 Super Deep Concave - Shop of Choice (ACI Dynamix)
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07-27-2014, 12:07 AM	#2
135Pats Major General 461 Rep 6,478 Posts Drives: A few BMWs Join Date: May 2012 Location: Maryland iTrader: (3)	On a FBO stock frame car we're talking IDK...5-10WHP to be gained aft of the downpipes? That's a guess on my part but bottom line is it's not a major area to pick up power. And that would be midpipes+axle back decatted. Once you really starting cranking up the boost (single turbo) then it becomes appreciably more important to ditch the factory system. The mid cats in particular become a bottle neck and some legitimate gains can be picked up in that regard. __________________ E88 N54 Alpinweiss/Coral Red/Motiv HTA 3586r Tial .82AR/Other stuff...652WHP F30 N55 XDrive EBII
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07-27-2014, 12:12 AM	#4
pwr hungry Banned 42 Rep 1,257 Posts Drives: 335 Join Date: Mar 2013 Location: Amer'ca iTrader: (2)	Exhaust is more a sound mod than anything on these cars.
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07-27-2014, 04:23 AM	#6
Pr335bob Captain 42 Rep 753 Posts Drives: Black on black e92 Join Date: Oct 2011 Location: Puerto Rico USA iTrader: (0)	It won't help that muc, I wouldn't waste 1500 on an exhaust to get 5whp maybe and sound cooler? Nope. Now the only benefit I see is maybe the weight saving. some exhaust like the vrsf among others claim 30-40 pounds ir I'm not mistaken. That's the only real benefit I think is worth mentioning or rather asking when purchasing an exhaust. How much weight am I going to shed vs stock?
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07-27-2014, 07:36 AM	#7
ihc95 Major 149 Rep 1,316 Posts Drives: 2021 X3 M40i, 2018 Mustang GT Join Date: Jul 2011 Location: NJ iTrader: (1) Garage List 2007 BMW 335i Coupe [0.00]	It's not a huge power adder but Grassroots Motorsports did a comparo of a bunch of exhausts and the HKS gained 13whp over stock. On a tuned/bolt-on car I'd imagine the gains would be more around 15-20whp. Not a ton but still decent imo. http://grassrootsmotorsports.com/art...ive-decisions/
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07-27-2014, 11:39 AM	#9
Transport3r Major 87 Rep 1,262 Posts Drives: 2011 N55 E90 Join Date: Sep 2010 Location: Melbourne, FL iTrader: (4)	Does anyone still sell that HKS exhaust? it seems like all i can find is the legamax which doesn't seem to have the H pipe... __________________ Josh-
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07-27-2014, 06:47 PM	#10
_ink Jedi samurai ninja turtle 636 Rep 3,021 Posts Drives: X3 M40i 2018 Join Date: May 2012 Location: Sydney, Australia iTrader: (0) Garage List 2018 X3 M40i [0.00]	Any RB'ers out there that have tested this with the upgrade?
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07-27-2014, 07:36 PM	#11
Eat.Sleep.Race Out Boosting... 248 Rep 3,987 Posts Drives: F30 335i M-Sport Join Date: Feb 2014 Location: Northern VA iTrader: (7)	Get the M2 exhaust, its actually really quality piece, a lot of people have had them for years with no issues, and it sounds great. I think better than almost all 1K$$ plus systems do.. http://www.ebay.com/itm/M2-BMW-E92-3...7c2eab&vxp=mtr __________________ Alpine White M-Sport F30
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07-27-2014, 08:19 PM	#15
Eat.Sleep.Race Out Boosting... 248 Rep 3,987 Posts Drives: F30 335i M-Sport Join Date: Feb 2014 Location: Northern VA iTrader: (7)	Here it is: __________________ Alpine White M-Sport F30
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07-27-2014, 08:39 PM	#21
4doorbmwpower Captain 63 Rep 954 Posts Drives: Montego Blue E90 335i Join Date: Nov 2010 Location: North Carolina iTrader: (3)	i wish i did a before and after dyno of my HPF gen2 addition. it is 35 lbs to the 78lb stock system and i SWEAR i could feel a difference but its all speculation. However i will note it cuts out mid pipes and mufflers and is a MASSIVE 3.5 inch ID exhaust. BEASTLY as all hell. I could see this flowing ST hp numbers EASSSSSY __________________ cp-e GTX3071R TT kit, cp-e quad exhaust, cp-e fuelbar, Stage 3 LPFP+lines, AEM EFI, Custom Meth kit, Apex EC7 18s w/R888 295s, Stoptech, M3 front, m-sport rear, cp-e difuser, Custom Headlights, CFS Radiator, Custom OC, 1000hp Lvl10 trans, DSS Axles, MFactory LSD, DEFIV lockdown kit, M3 refresh kit, KWv2's, cp-e project "4doorbmwpower"
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