I searched but didnt quite find the answer i was looking for. Since Ive done my h23 to h22 swap i need to know if my h23 cat will fit my h22 stock header and my apexi exhaust. when i searched all i found was everyone asking what the difference between all the aftermarket hi flow cats.

 

The Catalytic Converter should fit. As far as I know, the only difference between the H23 header and H22 header is the top part of it have different bolt patterns. The downpipe between the top part of the header and the catalytic converter is pretty much the same.

 

so if i used my h23 cat i would have to modify it some???

 

anybody know?