I have a b16 swap and have a dc 4-2-1 header and apex n1 muffler. i am getting custom piping ran..im ordering the cat now..i was looking at catco. which one should i get..should i just get the one for the b series motor or get a universal(cheaper)..also what size piping would u recomend on the exhaust. 2 1/2 or 2 1/4.

 

just get the crx cat. it fits fine witht b16 swap. and for piping 2.5 would be alright

 

i need one asap. i dont have a cat now. cause the crx one was attatched on the upper section of the exhaust manifold. and the new engine did not come with one. it would be cheaper to get a high flow cat. but not sure what to get. or where would u suggest getting the oem one....