ok im going to ahve a jdm itr header + some type of exhaust(buddy club pro spec?) My question is what kind of cat do i run? I know my stock cat wont fit but im not sure what type of cat to run so that it bolts right up, also i dont want a CEL so do u guys have any ideas of good high flow cats that dont cause that?

another thing, since the collector is 2.5 on the itr header, and my catback piping is 2.36 is this going to cause a problem?? only a few companies have a full 2.5 catback for a reasonable price, ive looked into t1r and i cant justify paying 750bucks for an exhaust system, calll me a cheap *** but those few extra bucks can go into something else. would my best bet to bet a 2.5 in and 2.36 out cat? thanks in advance

 

Contact SMSP. They made my custom carsound 2.5" cat for my JDM ITR 4-1 to T1R setup and im yet to have any problems. Everything has passed Md emissions fine

 

thanks man ill hit him up

 

no problem, good luck