New exhaust questions

[subsonic]

I would replace the cat when you are doing t he exhaust if it is the original cat. Might as well take care of it while you are digging into the exhaust.

I run the Walker Dynomax system and love it. My boddy has the Flowmaster on his XJ and that is nice too. Hard to go wrong with either one.

[Metlic53]

i run the APN header, 2.5 inch exhaust pipe to my 2.5 in magnaflow high flow cat, then 2.5 to my flowmaster super 40 dumped before axle with a 3.5 in turn down. dont dump the exhaust unless you want alot of drone, it gives me a headache lol im going to fix it. apn header made it sound better and felt more improvement from the engine.