Stock 904 how much hp can it handle

Quality parts and a GOOD converter it'll take a lot of abuse..stock driveshaft not so much snapped the rear yoke and twisted mine,that's when I upgraded to a 3" custom w/1350 yokes:thumbsup::thumbsup:
You should read up on drive shaft critical speed.I think there is a chart about it on mark Williams site.I have to admit i had no idea.