Thanks for the replies guys , I think I will stick with a 12 volt setup.. Has anybody had the problem like this ?? My car spins over just fine with big tub headers and exhaust on it. 11.5 to one small block . But once I take the pipes off it really hesitates to spin over even cold. Bucks like the timing is really high with the pipes off. Again sorry , not trying to hyjack this post..