ok so...im anxious to drive my car with the new manifold and long tubes on. I went from a GT40 and equal shorties w/ an off road X...to a RPM 2 with a 1/2" spacer and long tubes w/ an off road H. i have a stock bottom end w/ performer heads and E cam. and all the other standard stuff... what do u you think will be different...u think its worth the $400 out of pocket i spent?? OPINIONS PLEASE!!!