I ahve a dc4. I just recently picked up a JDM ITR header and ahve a S2 2.36" exhaust. But the question is will a JDM ITR cat flow just as good as a carsound 2.5" univ. cat. Im assuming carsounds measurements is for the outer diameter same with the JDM collector size. But which to get. Id get the JDM cat from passwordjdm or inlinefour. if i get carsound which model will i need? 2 o2 bosses or just one? I want the 2.5" and Ill find flanges and have my friend weld them in place. or just get JDM and have a bolt-on.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by silentdeath12886 &raquo;</TD></TR><TR><TD CLASS="quote">I ahve a dc4. I just recently picked up a JDM ITR header and ahve a S2 2.36" exhaust. But the question is will a JDM ITR cat flow just as good as a carsound 2.5" univ. cat. Im assuming carsounds measurements is for the outer diameter same with the JDM collector size. But which to get. Id get the JDM cat from passwordjdm or inlinefour. if i get carsound which model will i need? 2 o2 bosses or just one? I want the 2.5" and Ill find flanges and have my friend weld them in place. or just get JDM and have a bolt-on. </TD></TR></TABLE>

I'd suggest getting a bolt-on high-flow cat from SMSP. The JDM cat will not fit your setup without modification, and the SMSP cat will flow better.

 

where can i find it online? i cant find anything for it.

 

http://SMS-Products.com

 

just wondering why wont the jdm cat fit? is it too long/too short?

 

It's too short. It also has no bung for a secondary O2 sensor, if your car is OBD-II.