I know this is 5.0 talk, but I just installed a Pypes offroad x pipe on my 07 GT and thought you guys would like to hear.... it already had the Magnaflow axle back.... man, I think it sounds tits..... But you tell me.
http://www.youtube.com/watch?v=NfDvXmIG3BI
Nick
http://www.youtube.com/watch?v=NfDvXmIG3BI
Nick