i've got gibson shorties, true duals, no cats and 31in cherry bomb glass packs dumped before rear axle. Don't sound bad at cruising or takeoff but anything more than 3 grand and it sounds like sh*t. especially at WOT.
Not to high jack, but I';m haveing the same problem too. Gas gauge gets jumpy and at times will do 360's and hit the oil press gauge. Replaced the sending unit and it still does it, what else to check/replace?