ek hatch with b18c1 swap. which catalaytic converter are perfect fit onto EK exhaust system or it customed made is the only way?

 

I am still d series, but when I got a header, I picked up a cat for a 99-00 Si and it worked out good. Something will probably have to be modified depending on what exhaust you get because our stock cats are on the manifold. Fortunately I think my exhaust was supposed to be for an EX so it all bolted right up. It stuck out a little to much for me in the rear, but it was nothing a torch and a welder couldn't fix.

 

i have a b-series swap with b16 header and GSR exhaust, and it does not need the cat converter , but your best bet is with a test pipe or if you want to go street legal i would use a GSR it prolly better then the Si

 

Doesnt each one have different lengths?

 

I had a stock one that i found out was gutted later on, then i had a regular one custom installed to pass smog, and now i dont have one at all