Can someone please let me know what the oem exhaust piping and exhaust tip diameter are, been searching online and can't get a number. Also what piping diameter should you go to with an aftermarket exhaust for good gains? I have a 90mm AAM midpipe right now and I'm looking at an aftermarket exahust but its only 3" piping (76mm) so wondering if thats the oem size and if it will be pointless/bottleneck wth my midpipe?