Re: Another Exhaust Question..
Everything I have found available for sale exhaust wise for the 3.7 is 2.5". I've looked at headers-back systems from BBK, ARH, and I think it was Borla, and they all transition into 2.5" at the collector/midpipe connection. All of the cat-back exhaust systems I have found including Pypes, Magnaflow and others are all 2.5". All the axle-back systems are 2.5" as well. I'm pretty sure that it is safe to assume that the 3.7 has a 2.5" diameter system front to back.