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M2 Technical Topics > N55 Engine / Drivetrain / Exhaust / Bolt-ons / Tuning > Exhaust seals

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      06-14-2019, 11:04 AM   #1
guyno
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Exhaust seals

I'm putting a lightly used Akrapovic exhaust, and a new Akra catted DP on my car. I have both of them in my living room staring at me on a daily basis.

The DP did not come with any seal's in the box. (Not sure if that's standard or not. I reached out to the supplier i bought it off of to find out) and since the exhaust is used it doesn't have seals either.

Can anyone point me in the right direction to buy new seals? Can i just buy the OEM seals?
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      06-14-2019, 11:11 AM   #2
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seals as in gaskets? If so, the OEM turbo-to-DP gasket should for sure work since it will be the same size. does the Akra DP work with the stock exhaust? if so, I'd think the OEM DP-to-exhaust gasket would work as well. I'm not sure if there are others, though. I've only ever done my downpipe.
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      06-14-2019, 11:19 AM   #3
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Here are all the part numbers associated with changing the downpipe. I believe one clamp can be reused, but it's only $30 so I would change it anyway.

18307620349
18307581970
07119904992
18307525607
18307606136
33326768354 (need 8)

Total cost of all that is ~$115
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      06-14-2019, 12:39 PM   #4
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You can reuse everything. Never used any new gaskets on a BMW downpipe ever. You should move the copper/brass seal over to the new downpipe. Bend the alignment tab out of the way and it's easy peezy.
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      06-14-2019, 03:56 PM   #5
Anthony1s
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Quote:
Originally Posted by David1 View Post
You can reuse everything. Never used any new gaskets on a BMW downpipe ever. You should move the copper/brass seal over to the new downpipe. Bend the alignment tab out of the way and it's easy peezy.
You "can" but BMW says not to in the repair guide and downpipe mfgs recommend not to as well. Also gonna be a PIA to diagnose a CEL if you don't replace that stuff during install.
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      06-16-2019, 11:03 AM   #6
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Quote:
Originally Posted by Anthony1s View Post
Quote:
Originally Posted by David1 View Post
You can reuse everything. Never used any new gaskets on a BMW downpipe ever. You should move the copper/brass seal over to the new downpipe. Bend the alignment tab out of the way and it's easy peezy.
You "can" but BMW says not to in the repair guide and downpipe mfgs recommend not to as well. Also gonna be a PIA to diagnose a CEL if you don't replace that stuff during install.
Will have nothing to with a CEL. Been working on BMWs for 30 years and other turbo cars.
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      06-16-2019, 11:08 AM   #7
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Quote:
Originally Posted by David1 View Post
Will have nothing to with a CEL. Been working on BMWs for 30 years and other turbo cars.
Tell that to Fabspeed because they use it as part of their diagnosis process before accepting or denying a warranty claim for a CEL.
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      06-17-2019, 09:17 AM   #8
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Quote:
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Will have nothing to with a CEL. Been working on BMWs for 30 years and other turbo cars.
So you're saying that exhaust leaks around the converter won't set an O2 code?
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      06-17-2019, 09:43 AM   #9
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Never seen it unless the leak is huge but you would hear it to at that point.
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      06-17-2019, 09:33 PM   #10
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You can re-use gaskets but success really depends on the age of the car (lots of M2's are fairly low mileage) and condition of the gaskets. If it's a low mileage car it's likely you will be fine but over time they get brittle and may not seal properly on new pieces. I replace them for piece of mind as I really hate having to go back under my car and remove parts to fix something that I could have done right the first time but to each his own.
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      06-18-2019, 10:47 AM   #11
guyno
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So it looks like the only gasket is the turbo to down-pipe gasket. The rest are just clamps. Thanks for the help guys.
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      06-18-2019, 02:48 PM   #12
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Quote:
Originally Posted by guyno View Post
So it looks like the only gasket is the turbo to down-pipe gasket. The rest are just clamps. Thanks for the help guys.
There is a gasket between the downpipe and catback as well. It comes with the clamp, part # 18307620349. You'll most likely get the best prices going with Sun Motors BMW through eBay or by calling their parts dept. Make sure to talk to Brian, he's been great to work with.

I see you're from Pgh, I'll have to keep an eye out for you. Cheers!
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