i didnt blow the motor but i had a backfire and took the kit off before i eventually blew it. i was at the track one night, it was about 35 degrees and the track would not hook at all. i spun the drag radials bad off the line, hit the revv limiter and boom. luckily all it did was blow my Cold air intake off the throttle body and blow 3 gaskets, (EGR, AIT, and something else), but i took the kit off the next week. it was my stupidity that caused this to happen. i was spraying a 100 NX wet shot, and didnt lift my foot when it started spinning. didnt have a window switch, and wanted to beat that 5.0 real bad.
anyways, i'm faster with the blower now anyways, so it worked out.