Ok guys,
I need help gettin a new cat for my car. The only problem is, im not sure wtf to do. Im running a megan racing header from a 99-00 si. I have a bseries swap, obviously. I was told the outlet size is 2.25. I am currently running a apex`i ws2 which is about 2.36 inches. I am having trouble finding a cat that will match up. Anyone have any suggestions. Are my measurements correct? Was i told the correct size of the collector on the megan racing header?

Thanks
Mike

 

get a 2.25 inch cat. if the bolt holes dont line up for the exhaust red-rill them

platinum.

 

any suggestions? ebay only sells 2.5 inch ones for some gay reason

 

The difference between 2.25 and 2.36 is very small. Summit's website has bolt up cats that will fit. Just look one up for a 99-00 ex/si.