Had the M6 with 192k on the clock up on the dyno this morning. JC chip, K&N cone filter, Fahey track pipe, Tri-Fo exhaust, top end rebuild last summer. Rear wheel HP was 225 MAX - add 18 to 20% for drive train loss and it still only comes out to ~275 Hp Max. I feel that that figure is a bit low, at least I had always thought it was more powerful. But damn, it was a beautigul sound to hear, that s38 screaming at 7800 RPM!!!