My M6 '05 put down 334 rwhp stock, but the tuning is pulling timing bad up top. I guess each car's stock tune isn't the same, or the CPU's are reacting to the different driving environment for each car/owner. Then, there's always the variances between dyno's. I'm looking forward to adding headers, cat-back and getting a dyno tune, but it would be interesting to see what a tune would get me before the other mods are added.