Mac w/ORP sound clip...
It is very, very raspy between 2400 and 2900 RPM. It sounds like a metal vibration and sounds really bad.
I have MACS with cats and they sound really nice. But I had ORPs for a little while with a Borla muffler fully capped and it sounded really bad with my M6.
My friend has they same setup with an automatic, and his doesn't sound too bad. But with a manual car it sound much worse because we don't have a stall converter to get us past the rasp quickly.
Dan
http://www.ls1info.com/download.php

