Does anyone have the size for the midpipe to catback exhaust gasket? I have a slight leak and, after stacking up autozone gaskets, I would like a one-piece solution. I'm running a gutted SR high flow cat pipe. I swear someone (mazdatrix, RB, someone...) had thick gaskets for this application, but I can't seem to find them now. Any help would be appreciated!

Thanks,
Chris

Edit: It's the two-bolt flange in the picture below:



This is similar to what I am looking for. The one I saw was thicker and had 'padding' material instead of the multi-layer steel:

http://raceroots.com/index.php/produ...et-2-bolt.html

 

It uses a "donut" gasket that sits right at the choke (where the 2.5" section starts). P/N L307-40-581

 

Its 2.5", however the "generic" 2.5" gasket I got at Pep Boys didn't work so well so I pony'ed up for the OEM part from Mazda.. to the tune of $40...

O well, it worked.

 

Thanks for the advise guys but the doughnut piece doesn't fit over the midpipe, which is why I am looking for a thick-flange solution.

-Chris

 

If you're using the factory cat-back, keep in mind that it was designed to be a flexing point so it doesn't seal flat with the midpipe but sits right at the funnel-like section of the cat-back.

An alternative is to cut the factory choke and weld a flange for the catback.

 

I think this thread is in the wrong bucket. Can we get it moved over?