there's a big difference between a race trakc driven 300hp beast and a street driven one. There are people on this site with 350+ crank hp and stock transmissions. Street cars will never see the abuse of a race car. I would not worry about stripping gears.

1999 Silver Frost SVT #609 of 2760 Quaife, lightened SVT Flywheel, SPEC stage II clutch, removed resonator, k&n drop in - various other goodies too.