Alright I got a Greddy EVO on my car right now .. and I was thinking of replacing my dc sports 4-2-1 s/s header witha jdm 4-1 dc sports s/s header and since it has a 2.5" collector i'd get a catsound cat that's 2.5" but my question is what size will i need the other end of the catalytic convertor to be for my Greddy exhaust

 

bump^

 

I believe its 60 mm ID or 2.25".

 

get a reducer to modify ure b pipe(from 2.5 to 60mm)

try talking to smsp when he comes back. He is currently moving his shop.