Autocross and a 904 transmission

He's probably making 380-400 lbs-ft at 3000 rpm, lets say 390 lbs-ft, and probably peaks 450 lbs-ft probably around 4000 rpms, 390 x 57% = 222 hp & 450 x 76% = 342 hp.

So probably makes around 222 hp @ 3,000 rpm and 342 hp @ 4,000.

The kind of horsepower you'll have to play with even if 370 lbs-ft @ 2,500 rpm would equal 176 hp.

So obviously deeper gear more hp to the ground.
You and @AJ/FormS have got me worried ! I need to drive home afterwards! Appreciate the 904 isn’t an AX gearbox, but took that it’s pretty robust. My engine parts are all pretty high-end - only things that are stock are crank and connecting rods. Diff and rear end is brand new Quick Performance 3.50. How high is chance of failure? Should I be concerned?