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1G Which Downpipe gasket?

Posted by ODDUWON, Nov 14, 2019

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    ODDUWON Probationary Member

    Joined Sep 29, 2018
    NORWALK, California
    Which style Downpipe gasket will seal best? Im using a E316G on a 1G O2 housing to a stock 2.25" Downpipe.
    The last 2 I used where this style, both looked like this when I took them off. (2 metal layers with some black substance between them. Opening is banded with metal). I had leaks :ohdamn:


    Here are 3 types I got from Rockauto.
    left to right - (1) Mahle, (2) Felpro, (3) Bosal.

    (1) Mahle- 2 layers of metal with black stuff between. Opening is banded with metal. Gasket is separating in the package.

    (2) Felpro - multi layer graphite. Opening is banded with metal.

    (3) Bosal- 2 layers of metal with black stuff between. Opening is NOT banded.

    I am using a 7cm, 6-ply multi-layer metal gasket from ExtremePsi for the manifold-to-turbo gasket.
    They have the same style for the O2 housing-to-downpipe, but it looks really thick. Not sure if it will cause the downpipe bracket-to-O2 housing bolt to misalign if I use both of that style.

    What do you guys think?

    214  1

    1990 Eagle Talon TSi
    fwd · manual · 1G DSM
  2. buddahboost

    buddahboost Proven Member

    Joined Aug 15, 2007
    I have the Mahle, no leaks but i've only got idle time and some driving around the block. Otherwise, I'd get the extremepsi one but I usually have to have a shopping list to make it worth the shipping on everything.
  3. Bleakley

    Bleakley Proven Member

    Joined Jan 29, 2017
    Pittsburgh, Pennsylvania
    Those ones I’ve had good luck with tightening, running car and heating them up, then retightening.
    Until I figured out this sequence I used to pop those gaskets easy money. Lol.

    I have the 6 ply on both the turbo to manifold and o2 housing to downpipe. Pretty sure no leaks.

    If I’m being 100% honest. Was hesitant and Not really a fan of the 6 ply gaskets, but they seem to be working.
    I think the very least they should be riveted / setup just like the head to manifold gasket instead of banded.

    Street Build 765  1

    1995 Eagle Talon TSi
    fwd · automatic · 2G DSM
    buddahboost likes this.
  4. Dreams Realized

    Dreams Realized Proven Member

    Joined Jul 23, 2018
    Seattle, Washington
    Mahle aren't great in my opinion, I used to use the felpro one and had luck with it until I couldn't find the right size at the parts store anymore. I ordered 2 Vibrant Performance ones from STM and haven't looked back.

    Also I know I am a 2g guy but I use a 1g exhaust that I hacked up a bunch and rewelded to fit my car

    Street Build 699  5

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
  5. turbosax2

    turbosax2 Moderator

    Joined Nov 19, 2006
    Mechanicsburg, Pennsylvania
    I use Vibrant gaskets. They never look great when the downpipe is removed, but I can reuse them a couple times if needed. They seem to seal pretty well even with surfaces that aren't 100% flat.

    3K  24

    1999 Mitsubishi Eclipse GSX
    13.543 @ 100.000 · 2G DSM
  6. Vegas smith

    Vegas smith Proven Member

    Joined Dec 2, 2002
    Houston, Texas
    I can vouch for the extremepsi. No leaks on mine.

    Street Build 3K  10

    1993 Eagle Talon TSi AWD
    awd · manual · 1G DSM
  7. awd4g63turbo

    awd4g63turbo Proven Member

    Joined Sep 3, 2007
    Greenville, North Carolina
    Either one of them should work fine, but I recommend using copper spray on whichever gasket you use. I have reused gaskets numerous times that I have copper sprayed and none have leaked.

    Street Build 3K  12

    1990 Eagle Talon TSi AWD
    awd · automatic · 1G DSM
  8. rabenne

    rabenne Proven Member

    Joined Apr 21, 2006
    Racine, Wisconsin
    I use the copper ones...

    It wasnt a perfect fit, but a bit of trimming and it works great. I have re-used it several times. Once the crush ring is crushed, I expected it to leak, but it is thick enough and soft enough that it seals up every time!

    Street Build 238  5

    1996 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM

    Street Build 183  12

    1997 Mitsubishi Eclipse GST
    fwd · automatic · 2G DSM

    Street Build 7K  9

    1995 Eagle Talon TSi
    awd · manual · 2G DSM

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