My 5.7 made 470 rwhp with 6# of boost with the tune supplied with the supercharger. The jump from 500 to 550 rwhp does not sound like much, but to do it takes 1000s of dollars. Forged Block 5.7 VVT. 10.98 1/4 @ 125.6 MPH. 1.61 60' time. Stock Block 5.7. ND1hKvJ.