Hi guys, I have the AAM test pipes installed on my car with the stock exhaust. I know I have an exhaust leak from the header to the test pipe on the passenger side because i can hear it and when i go under the car i could feel the ait leaking. I have the original dounut gasket installed but it's still leaking. I was wondering if I install an extra 3 bolt gasket on both side maybe it could stop the leak? My question is what is the inside diameter of the stock header to the cat so I can get a 3 bolt gasket with the right diameter. Is it 2.25" or 2.5"? I know the aam is 2.5", so let say if the stock header id is 2.25" should i get a gasket that is 2.25 or 2.5"?
thanks.

 

just hit up berk they sell the gasket you are looking for and i would not even use that doughnut gasket.

 

Get a 2.25" gasket. I believe the inner diameter of the oem manifolds is 2.25"..

 

and remember to put lots of the copper RTV. let it set for little while or run but dont floor it before it gets a chance to dry.

 

they make a graphite gasket now not just the copper one. no need for rtv.

 

wasn't aware. when I did mine they didn't have those. thanks for the info though, I might have to redo mine when I get motivated.

 

thanks for the help guys. I called Berk for the gasket and they told me i can use a their graphite 2.5" gasket. I would thought i need a 2.25 gasket but he said that i can use a 2.5 as long as the ID is not bigger than 2.5", i dunno but that seems to be right to me.

 

yes it is right don't worry