Some perspective on prochargers...From what little I do know about them, they are pretty damn efficient. One of the guys I used to know slapped a D1 on his 03 Mach 1...basic all forged 9:1 shortblock, cleaned up stock heads, competition valve job, FR500 cams (only about 210* at 050), and the supporting fuel system...when he finally got the fuel delivery squared away, it pushed 594rwhp...I think the boost was around 18 psi. I only got to ride in it once, but it was brutally fast to me...