Ok I know I can't be the only one with this problem. I've got an o/r h pipe with pipes m80 mufflers in the gt catback. Car sounds amazing at idle and driving up to 2900 rpms but at 3000rpm the exhaust gets ridiculously loud and sounds like a Honda. What exactly causes the note to change so bad? I'll post sound clips Monday if you can't imagine what I'm trying to explain.