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      06-08-2018, 10:26 AM   #1
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Downpipe gasket/seal replacement after multiple install/uninstall?

I need to uninstall my aftermarket downpipe, install stock downpipe, and then reinstall aftermarket downpipe again. I've done that a couple of times in the past and I remember my mechanic saying last year that I should expect to replace gasket(s) the next time I do that.

What do you think? Is part "3" in the attached diagram what I need to get?
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      06-08-2018, 10:54 AM   #2
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YES!!! Replace gasket.

Assume the condition of your clamps (#2 and #4) are good. Maybe it's time to replace all three?
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      06-08-2018, 11:30 AM   #3
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Watch Kies Motorsport's video on the downpipe install. He has the part #s in his video description.
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      06-08-2018, 11:49 AM   #4
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for $20, it's worth replacing. Especially when you consider how much effort it takes to replace it if you end up with a leak after install.
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      06-08-2018, 11:56 AM   #5
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http://*************/new-downpipe/

"New Lower V-Band
BMW part #18307620349 (here at ECS, I just ended up getting it at the dealer)
This is necessary as it comes with some sort of a crush gasket that can get mangled when disassembling the stock DP, this really should be replaced."

Step 16 shows how mangled it gets...

[IMG]https://i0.wp.com/*************/wp-content/uploads/2018/02/IMG-20180208-WA0004.jpeg?resize=300%2C169[/IMG]
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      06-08-2018, 01:09 PM   #6
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+1 for replacing.

Repeatedly bending the tabs back and forth won't be good for the seal and shape either.
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      06-08-2018, 01:50 PM   #7
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FWIW I bought item 3 in the OP for when I installed my VRSF catless DP and never used it. When I took off my stock DP there was no gasket and trying to fit the new gasket wasn't working so I just didn't install it. I have no exhaust leaks.
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      06-09-2018, 08:30 AM   #8
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Thanks everyone, it looks like I need to be buying the gasket in advance!

But Jared's input is confusing for sure:

Quote:
Originally Posted by JaredG_F30 View Post
FWIW I bought item 3 in the OP for when I installed my VRSF catless DP and never used it. When I took off my stock DP there was no gasket and trying to fit the new gasket wasn't working so I just didn't install it. I have no exhaust leaks.
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      06-09-2018, 04:24 PM   #9
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Quote:
Originally Posted by M-SP0RT View Post
Thanks everyone, it looks like I need to be buying the gasket in advance!

But Jared's input is confusing for sure:
My car had no gasket as well, only the upper and lower clamp
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      06-09-2018, 06:12 PM   #10
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No gasket here either. No leaks. Itís more problem then itís worth
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      06-09-2018, 08:18 PM   #11
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Mine is 2014 with 4" pipe if that makes a difference
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      06-09-2018, 09:56 PM   #12
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There's definitely a gasket on top. It usually stays on the turbo side as it sits inside of a channel on the turbo flange. I've done this swap a few times and in my experience, I believe the top gasket can handle a few swaps before it starts leaking. Now the bottom one needs to be replaced every time or it'll leak a little or a lot depending on how it goes back, but it'll certainly leak. I would recommend replacing top and bottom if possible.
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      06-11-2018, 09:35 AM   #13
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Same here!!

Quote:
Originally Posted by M-SP0RT View Post
Mine is 2014 with 4" pipe if that makes a difference
My suggestion is to buy the gasket. It's only like $5. Better to have and not need then to need and not have.
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      11-08-2019, 06:28 PM   #14
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Quote:
Originally Posted by JaredG_F30 View Post
Same here!!



My suggestion is to buy the gasket. It's only like $5. Better to have and not need then to need and not have.
The gasket I ended up buying seems to be significantly smaller than the opening/old gasket... is there some trick to this install?
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      11-09-2019, 12:18 AM   #15
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Quote:
Originally Posted by Polo08816 View Post
Quote:
Originally Posted by JaredG_F30 View Post
Same here!!



My suggestion is to buy the gasket. It's only like $5. Better to have and not need then to need and not have.
The gasket I ended up buying seems to be significantly smaller than the opening/old gasket... is there some trick to this install?
Did it come in a sealed bag with a part number or was it loose? Often parts bins get the gaskets for the earlier 3.5-inch and later 4-inch downpipes mixed together, and then they give you the wrong one. Happened to me.
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      11-09-2019, 12:25 AM   #16
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When I bought new clamps for my downpipe the gasket was fitted inside the clamps.
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      11-09-2019, 09:47 AM   #17
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I'm fairly certain mine had the gasket, and I intended to replace it, but was not sure how to get the old gasket out...
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      11-11-2019, 12:07 PM   #18
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Anyone have the part number for a replacement gasket? Thanks.
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      11-11-2019, 01:48 PM   #19
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Quote:
Originally Posted by pdegene View Post
I'm fairly certain mine had the gasket, and I intended to replace it, but was not sure how to get the old gasket out...
A pick tool or a needle nose plier will pull the old gasket right out.
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