I think I read that both input and output shaft are safely rated at 600hp, which is obviously a good but more that the factory ever wanted out of them. You already know I'm sure that many racers have exceeded that number, and I'm sure some by far without problems. You also know racing is dangerous, and risks go up, along with horsepower. I'd bet a lot of people have pushed the limit beyond 600 hp, and I'm sure my own 10.0 car has the stock shafts in it still as well. But, if it's only money lol......
