My 07 exhaust system was beat up pretty bad so I just replaced it tonight with a new 06 system. Fired it up to check it out, and after it was warm when I snap the throttle it repeatedly falls on its face or dies. There were no problems before. I did just clean my air filter, and oiled it pretty heavy. I don't know if it is from the filter, or if it needs tuned to the 06 system. I did compare them, and the 07 has a bigger diameter header, and a smaller diameter outlet. The 06 has a smaller diameter header, and a bigger diameter outlet.