so i just got finishe removing the exhaust mani and o2 housing to be replaced with megan parts, but found no gasket between the o2 and the downpipe. Should there be one? i thought so, correct me if im wrong.

 

There probably is but you don't notice it. It's a dougnut gasket that fits around the inner tubing that comes out of the 02 housing.

It looks like this:


Also, this page shows the o2 housing with and without the gasket installed.
http://www.jonesland.com/evo/Buschur_Install.htm

 

It is an aftermarket downpipe and I triple checked no doughnut gasket do I need to get 1 or just install as it was without one

 

So you already had an aftermarket downpipe installed but are replacing it with a megan downpipe? If that's the case, then I guess there is a really good chance that the gasket was already removed to install the aftermarket downpipe that you are taking off.

My downpipe is from Buschur, and it didn't require a gasket. But after searching, it looks like you're supposed to re-use the OEM doughnut gasket for the Megan downpipe: https://www.evolutionm.net/forums/ev...837-donut.html

I guess you're going to need to find one.

 

Not replacing the down pipe just the o2 and manifold. The downpipe is not changing it is aftermarket already

 

yeh i think Buschur's dp the only one that doesnt require a gasket, just make one out of gasket maker.

 

Good to know your supposed to use the stock doughnut gasket with the megan dp