BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read

Go Back   M3Post - BMW M3 Forum > E90/E92 M3 Technical Topics > Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications
Lux Angel Eyes
Post Reply
Thread Tools Search this Thread
      10-28-2012, 01:25 PM   #1
LarThaL's Avatar
Drives: 2011 M3
Join Date: Apr 2011
Location: West Springfield, MA

Posts: 2,594
iTrader: (0)

Max possible NA power gain staying legal?

As the title says....what is the maximum possible NA power gain while staying emissions legal? Dinan Stroker doesn't count.
Precision tool: 2011 BMW ///M3
Sledgehammer: 2014 Audi S6

LarThaL is offline  
Reply With Quote
      10-28-2012, 01:59 PM   #2
Mike Benvo
BimmerPost Supporting Vendor

Mike Benvo's Avatar
Drives: 08 E90 M3 / 400whp Turbo 7
Join Date: Apr 2008
Location: SoCal

Posts: 4,679
iTrader: (7)

Garage List
2008 BMW M3  [5.00]
1990 BMW 735i Turbo  [5.00]
2004 BMW M3  [0.00]
Send a message via Skype™ to Mike Benvo
Depends on what state you're in.

In California, pretty much no gain...

We get to be the C in CARB legal where as everyone else is less strict "ARB" legal.

I think technically even changing the rear section here is against the law.

-----| Like us on Facebook | Instagram || Tuning Information | Remote Coding |-----
----Visit us at - Emotion. Driven. | Toll Free: (888) 557-5133----
Mike Benvo is offline   United_States
Reply With Quote
      10-28-2012, 03:47 PM   #3
FormulaMMM's Avatar
Drives: E90 M3
Join Date: Oct 2011
Location: Midwest

Posts: 1,379
iTrader: (1)

Semi-educated guess: filter, pulley, tune, catback (if you believe that adds a couple) for maybe 20-25 bhp'ish.
DCT E90 M3: Akrapovic Evolution, KW Clubsport, Stoptech ST-40 Front + Pagid RS29 | Stock Rear + Stoptech SP, Apex EC-7 18x10 ET25 + Nitto NT01 275/35/18 (for track), tbd...
Past: Velos Designwerks Tune, Megan Racing Catback, Macht Schnell Filter
FormulaMMM is offline   United_States
Reply With Quote
      10-29-2012, 04:01 AM   #4
roastbeef's Avatar
Drives: E92 M3
Join Date: Nov 2010
Location: Orange County, CA

Posts: 809
iTrader: (0)

resonators that use factory cats, pulleys, exhaust, intake... each claim around 10hp, but we know those numbers are merely claims. but you can do ricer math and say you have 450+ hp.
roastbeef is offline   United_States
Reply With Quote
      10-29-2012, 08:28 AM   #5
Lieutenant Colonel
Drives: 2009 E92 M3
Join Date: Feb 2009
Location: New York

Posts: 1,865
iTrader: (1)

Filter is negligible
I'm not crazy about changing drive pullys

I'm not crazy about catless because of the smell, and carbon emissions.

Pretty much just HFC X-pipe and a Tune...Probably about 20-30 whp.
CSanto is offline  
Reply With Quote
      10-29-2012, 09:06 AM   #6
Lieutenant Colonel
Drives: 08 E90 M3, 99 E36 M3 Turbo
Join Date: Feb 2011
Location: Concord, NH

Posts: 1,666
iTrader: (3)

How legal does the legal have to be? M3DCTBT is in the Boston area and tunes. He says he can get about 425 rwhp (non dynojet) out of an M3 with 300 cell high flow cats plus other mods and pass plug in OBD2 inspection. I have not yet seen Dynojet results, but even 400 rwhp SAE dynojet through 300 cell cats would be pretty good.
pbonsalb is offline  
Reply With Quote
Post Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -5. The time now is 05:23 AM.

Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.,,,,,,,,, logo and trademark are properties of BIMMERPOST