BMW M3 Forum
BMW M3 Forum BMW M3 Gallery BMW M3 Reviews BMW M3 Social Groups BMW M3 Chat M3Forum Sponsors >>
Loading


Mobile M3forum
Go Back   BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X) > BMW M3 Discussions > E46 M3 (2001-2006)
Tire Rack Buy Winter Tires Now!
Not a member? Register Now!
Register Gallery All Albums Garage Search Today's Posts Mark Forums Read Calendar FAQ

E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


Reply
 
Thread Tools Display Modes
Old Thu, Jan-17-2019, 02:02:00 AM   #1
M3 dude
Registered User
 
Join Date: Jan 2014
Posts: 438
Reputation: 0 M3 dude is on a distinguished road

Australia




Default simple lightweight sec 3.

hi all,

i'm looking to save abit of weight and make some space under the rear of my m3.
i'm not worried about appearance (having the quad tips) but some sound attenuation is good. main motivator is shedding around 20kg (40lb) from behind the rear axle.
so, i'm looking to adapt something like a borla #400287 universal muffler to the outlet of the sec 2 - then route the pipes straight out the back.

anyone done something similar? any feedback on drone? or any other feasibility issues?

thanks
Jump to top M3 dude is offline   Reply With Quote
Sponsored Links
Register now and remove these ads
Old Thu, Jan-17-2019, 02:11:02 AM   #2
AussieE46M3
Registered User
 
Join Date: Nov 2015
Posts: 254
In the garage:
Reputation: 0 AussieE46M3 is on a distinguished road
Location: Gold Coast

Australia




Default Re: simple lightweight sec 3.

Side pipes? M3 GTR style?

I'd imagine that will take out some tubing.

For to ADR compliant you'd have to make the rear windows permanently shut and have it out just in front of the rear wheel on the RHS.
Jump to top AussieE46M3 is offline   Reply With Quote
Old Thu, Jan-17-2019, 02:29:43 AM   #3
M3 dude
Registered User
 
Join Date: Jan 2014
Posts: 438
Reputation: 0 M3 dude is on a distinguished road

Australia




Default Re: simple lightweight sec 3.

Quote:
Originally Posted by AussieE46M3 View Post
Side pipes? M3 GTR style?

I'd imagine that will take out some tubing.

For to ADR compliant you'd have to make the rear windows permanently shut and have it out just in front of the rear wheel on the RHS.
not even, still have it firing out the back.
but the exhaust will have a straighter path than most a/market exhausts.
so yeh, less tubing, less bends, keep it simple, cheap, light.

edit: side pipes would be cool.
Jump to top M3 dude is offline   Reply With Quote
Old Thu, Jan-17-2019, 03:15:05 AM   #4
mrgizmo04
Registered User
 
mrgizmo04's Avatar
 
Join Date: Jan 2017
Posts: 2,787
In the garage:
Reputation: 0 mrgizmo04 is on a distinguished road
Location: Menlo Park

United States




Default Re: simple lightweight sec 3.

That sounds like it'll be loud!

Sent from my SM-G950U using Tapatalk
__________________
'85 528e 164k miles (sold)
'05 M3 6MT coupe

All DIY: VANOS, WPC rod bearings, full SS (SS stepped V1 headers, catted S1, stock S2, SS sport), AFD E85 Proflex kit, Ohlins R&T/Hyperco 375f Swift 672r/GC street tops and camber plates, 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, Sachs clutch/flywheel, rear main, Beyer driveshaft, valve adjustment, cooling refresh.

Happy to help with VANOS or any other DIY job around NorCal. Have various specialty tools (VANOS, RTAB, engine bar, valve adjustment, tranny jack, ball joint separator, pilot bearing puller, tap&die kit, etc).
Jump to top mrgizmo04 is online now   Reply With Quote
Old Thu, Jan-17-2019, 03:16:19 AM   #5
TboneM3
YNWA
 
TboneM3's Avatar
 
Join Date: Oct 2009
Posts: 8,525
In the garage:
Reputation: 0 TboneM3 is on a distinguished road
Location: Socal

United States




Default Re: simple lightweight sec 3.

Quote:
Originally Posted by M3 dude View Post
main motivator is shedding around 20kg (40lb) from behind the rear axle.
Why's that, did you remove 40lbs from the front already? Or is this for drifting or something?

There are people that run just straight pipes. Or people that run a single canister, like for a single 3.5" track high hp exhaust.

The stocker is big and heavy on purpose though, which you moght have read about. Do you want LOUD?
__________________
/// 2004 SilberGrau M3 Coupe 6MT slicktop manual seats zero options ~3200lbs JOURNAL
_


Evolve-R Alpha N Evolve CSL CF Airbox Eventuri Scoop Supersprint V1 stepped 2.5" SS V1 S pipes 2.5" + 200 cell HFC OE sect 2 SCZA 2.5" sect 3 Besian RE pullies WPC'd OE bearings oil catch can fan/SAP/washer delete CSL battery

GroundControl S/A Koni (Hyperco/Eibach 300/550) + tall RSMs Hotchkis front sway (med) rear strut bar TMS camber & subframe plates SPC alum rear camber arms RE trans mounts AKG poly subf/diff 95a SDW RTAB weighted ///M knob + ZHP alcantara boot + UUC DSSR + delrin bushing Mason clutch pedal + brass bushing TMS black pedals delrin brake pedal bushing

OE CSL trunk Sportline 8S 18"x8.5/9.5" MPSS 245/275 APEX 75mm Studs 12mm/10mm F/R spacers Brembo 996 4 pot 36/40 345mm CSL & 28/30 328mm CSL ZHP "712" rack Pioneer/CDT/Eclipse/Kicker
Jump to top TboneM3 is offline   Reply With Quote
Old Thu, Jan-17-2019, 03:37:40 AM   #6
STAATS
Registered User
 
STAATS's Avatar
 
Join Date: May 2015
Posts: 525
In the garage:
Reputation: 0 STAATS is on a distinguished road

Australia




Default Re: simple lightweight sec 3.

unfortunately you can't really strip much weight back there and maintain ADR compliance in terms of noise... I am already struggling to see how I will pass noise with SS V2 Headers, SS Metcallic Cats, SS Resonated X-pipe and SS Sport Muffler...

SS Street box strips a few pounds and would maintain ADR compliance... other than that the best way to strip exhaust weight and maintain noise compliance is really to keep the stock back box but go to SS Metallic Cats (saves a few kgs) and SS Resonated X-pipe will save a few kgs also... there is a few pounds again to be saved on the SS Sport box over a SS Street but its still borderline if it will pass... I am getting access to a noise meter next week and will be testing my setup so will feedback if it is ADR compliant... I guess if you are ignoring Mod approval then providing its within a few dB's of ADR compliance then it won't be enough to trigger cops to yellow sticker you anyway so won't be an issue, but for me I am in the midst of Engineering Approval process so I am stuck with having to comply *sigh* haha.
__________________
STAATS

BMW E46 M3 Vehicle Log Book & Service Tracker Tool: http://www.m3forum.net/m3forum/showthread.php?t=564731

BMW E46 M3 Vehicle Data Record & Modification Journal Template: http://www.m3forum.net/m3forum/showthread.php?t=566440

2003 BMW E46 M3 Street / Road Rally Build: http://www.m3forum.net/m3forum/showthread.php?t=566468
Jump to top STAATS is offline   Reply With Quote
Old Thu, Jan-17-2019, 03:42:05 AM   #7
STAATS
Registered User
 
STAATS's Avatar
 
Join Date: May 2015
Posts: 525
In the garage:
Reputation: 0 STAATS is on a distinguished road

Australia




Default Re: simple lightweight sec 3.

alternatively... if the rest of your exhaust system is stock then SS lightweight race box on an otherwise stock exhaust I believe just passes noise test... I know Rajvosa had a SS LWR box on his E46 M3 approved once upon a time...
__________________
STAATS

BMW E46 M3 Vehicle Log Book & Service Tracker Tool: http://www.m3forum.net/m3forum/showthread.php?t=564731

BMW E46 M3 Vehicle Data Record & Modification Journal Template: http://www.m3forum.net/m3forum/showthread.php?t=566440

2003 BMW E46 M3 Street / Road Rally Build: http://www.m3forum.net/m3forum/showthread.php?t=566468
Jump to top STAATS is offline   Reply With Quote
Old Thu, Jan-17-2019, 04:56:19 AM   #8
Rajvosa
Registered User
 
Join Date: May 2010
Posts: 534
Reputation: 0 Rajvosa is on a distinguished road
Location: Australia





Default Re: simple lightweight sec 3.

Quote:
Originally Posted by STAATS View Post
alternatively... if the rest of your exhaust system is stock then SS lightweight race box on an otherwise stock exhaust I believe just passes noise test... I know Rajvosa had a SS LWR box on his E46 M3 approved once upon a time...
Hi mate nah wasnít on the SS lightweight race. It was either street or sport version. After I sold all those I got LWR on
Jump to top Rajvosa is online now   Reply With Quote
Old Thu, Jan-17-2019, 05:56:29 AM   #9
STAATS
Registered User
 
STAATS's Avatar
 
Join Date: May 2015
Posts: 525
In the garage:
Reputation: 0 STAATS is on a distinguished road

Australia




Default Re: simple lightweight sec 3.

Quote:
Originally Posted by Rajvosa View Post
Hi mate nah wasnít on the SS lightweight race. It was either street or sport version. After I sold all those I got LWR on
Ahhhh must have been the Sport then... Street is quieter than stock on a stock system I believe so no cop would have pulled you on that...

Do you remember what dB reading and at what rpm etc you got when you had to do that? (and was the system stock other than the back box?)
__________________
STAATS

BMW E46 M3 Vehicle Log Book & Service Tracker Tool: http://www.m3forum.net/m3forum/showthread.php?t=564731

BMW E46 M3 Vehicle Data Record & Modification Journal Template: http://www.m3forum.net/m3forum/showthread.php?t=566440

2003 BMW E46 M3 Street / Road Rally Build: http://www.m3forum.net/m3forum/showthread.php?t=566468
Jump to top STAATS is offline   Reply With Quote
Old Thu, Jan-17-2019, 07:45:31 AM   #10
Rajvosa
Registered User
 
Join Date: May 2010
Posts: 534
Reputation: 0 Rajvosa is on a distinguished road
Location: Australia





Default Re: simple lightweight sec 3.

Quote:
Originally Posted by STAATS View Post
Ahhhh must have been the Sport then... Street is quieter than stock on a stock system I believe so no cop would have pulled you on that...

Do you remember what dB reading and at what rpm etc you got when you had to do that? (and was the system stock other than the back box?)
Man couldnít tell ya what numbers I got. I had V2 headers, resonated x pipe and whatever muffler it was. I only had it engineered cos I was getting brakes engineered so was a convenience thing. Didnít get pulled over about it
Jump to top Rajvosa is online now   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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. The time now is 04:57:10 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
M3Forum.com and M3forum.net is in no way sponsored, endorsed or affiliated by or with BMW NA / BMW AG or any of it's subsidiaries or vendors.
BMW and M3 (E90 M3 | E92 M3 | E93 M3 | E46 M3 | E36 M3 | E30 M3) are registered trademarks of BMW AG.
M3Forum Terms of Service
Copyright ©1999-2017 M3Forum.com
Discussing simple lightweight sec 3. in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)