small exhaust leak

1MOREMOD · 08-12-2011, 04:34 PM

installed a challenge sport x pipe couple weeks ago and sounds good but a little muddy like i have a leak or something vibrating under there and touching the heat shield. got the car up in the air today to look and formed the heat shield so not any touching parts just in case. i have a leak at the fitting between the resonators and the rear axle section. i can put my hand by it and feel it on both sides right where the clamp comes closed and there is a little gap. the stock axle back has a little crimp in it at these points maybe from overtightening from the factory. any idea how to seal this leak. just tried to use some high temp sealant in the area its leaking and am letting it set up. dont really want to weld these together but want it to sound correct.

mkPOTO · 10-11-2012, 06:24 PM

I'm having the same issue, have you resolved it?

THE TECH · 10-12-2012, 09:55 AM

Pic?

Jon@Bimmersport Automotive · 10-12-2012, 10:59 AM

Try pushing the muffler tips in to put some pressure making the fit tighter, as someone is pushing the rear muffler into the midsection tighten the clamps fully and recheck for leaks.

M3PO · 10-12-2012, 05:54 PM

I've noticed that the clamps bend inward with use so they don't apply much pressure to the joint. Taking them off and bending the tabs where the bolt goes through will allow you to get it a bit tighter. Otherwise, some high temp silicone is probably your best bet.

m3an · 10-12-2012, 06:19 PM

You really need 2 people here are creative moves

.

You need to push the pipes into the socket fittiing while tightening on the clamp to maintain a seal or they will always leak a little bit (not bad but noticeable).

If all else fails use exhaust/rtv silicone

08-12-2011, 04:34 PM	#1
1MOREMOD Major General Drives: at a moderate pace Join Date: Mar 2009 Location: garage Posts: 6,486 iTrader: (3)	small exhaust leak installed a challenge sport x pipe couple weeks ago and sounds good but a little muddy like i have a leak or something vibrating under there and touching the heat shield. got the car up in the air today to look and formed the heat shield so not any touching parts just in case. i have a leak at the fitting between the resonators and the rear axle section. i can put my hand by it and feel it on both sides right where the clamp comes closed and there is a little gap. the stock axle back has a little crimp in it at these points maybe from overtightening from the factory. any idea how to seal this leak. just tried to use some high temp sealant in the area its leaking and am letting it set up. dont really want to weld these together but want it to sound correct. __________________ 02 Tiag e46 M3\|6MT\|GC plates\|MCS c.o.\|GC race control arms\|GC bushings & bearings\|BW eng. & tran. mounts\|subframe kit\|BW race shifter\|BW Jaffster knob\|Euro header\|Eisenmann sport\|K&N c.a.i.\|Seibon CF hood\|CSL bumper\|CSL brakes\|RS19s\|SS lines\|half cage\|Recaro profi\|Profi 2 harness\|race pulleys\|BMWpedals\|Apex studs\|1995 Ford Probe gt chump car\|
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10-11-2012, 06:24 PM	#2
mkPOTO Mr. Nice Says Hello Drives: 1999 528I Join Date: Dec 2008 Location: Chicago Posts: 13,489 iTrader: (19) Garage List 2008 BMW E92 M3 [2.66] 1999 BMW E39 528i [2.20] 2007 BMW E92 335I [3.00]	I'm having the same issue, have you resolved it? __________________ BMW E92 M3 EVOLVE Stage II \| EVOLVE X-Pipe \| EVOLVE E-Tronic Exhaust Macht Schnell Stage II intake \| KW V3 \| Volk TE37SL \| BMW Performance Spoiler

10-12-2012, 09:55 AM	#3
THE TECH BimmerPost Supporting Vendor Drives: BPMsport 2012 E92 M3 Join Date: Jun 2011 Location: Kansas Posts: 11,884 iTrader: (39)	Pic? __________________ Check us out on Facebook at BPMsportLabs

10-12-2012, 05:54 PM	#5
M3PO Colonel Drives: '08 IB E92 Join Date: Sep 2011 Location: OC Posts: 2,176 iTrader: (6)	I've noticed that the clamps bend inward with use so they don't apply much pressure to the joint. Taking them off and bending the tabs where the bolt goes through will allow you to get it a bit tighter. Otherwise, some high temp silicone is probably your best bet. __________________ 2008 IB E92 M3\| BBS \| KW \| Arkym \| Platte Forme A.G. \| Active Autowerke \| K&N \| Fabspeed \| Dinan \| Evolve-R

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10-12-2012, 10:59 AM	#4
Jon@Bimmersport Automotive First Lieutenant Drives: E46 M3 Active Supercharged Join Date: Jun 2008 Location: Mississauga, On Canada Posts: 340 iTrader: (0) Garage List 2003.5 BMW M3 [5.00]	Try pushing the muffler tips in to put some pressure making the fit tighter, as someone is pushing the rear muffler into the midsection tighten the clamps fully and recheck for leaks.

10-12-2012, 06:19 PM	#6
m3an Banned Drives: M3 Join Date: Oct 2010 Location: South Florida Posts: 1,612 iTrader: (2)	You really need 2 people here are creative moves . You need to push the pipes into the socket fittiing while tightening on the clamp to maintain a seal or they will always leak a little bit (not bad but noticeable). If all else fails use exhaust/rtv silicone