I'm looking to swap out my stock cats and y pipe on a 2003 g35c 6MT. I'm looking at berks HFC or AAM HFC and putting in the MD xyz w/ resonator, I have a magnaflow exhaust (2.5") I'm finding it really hard to find a y pipe that has a 2.5" outlet. I really don't want rasp or hissing I'm guessing the xyz pipe will eliminate most of that with the resonator. As well it's really hard to find any good feedback on AAM's HFC so would like to hear someone's opinion on that set. They also make a y pipe was thinking they make be a good combo that would eliminate rasping.