i have a JRSC on my B16 00SI.

Its the 6psi kit, with I/H/E.

The exhaust setup is currently like this: Kamikaze header 4-1 with 2.25 Collector, Stock cat, and 2.25 Greddy Evo cat back.

My question is, should i get a 2.25" free flow cat to match up with the rest of the exhaust, or should i get a 2.5" cat with 2.25" flanges?

Thanks for the help!

 

I run a carsound cat on my R. I ran a faster time with the cat than I did with a test pipe. The H/F cat is a good upgrade over the stock one. Not to mention if U run a str8 thru pipe it's stupid loud!!!