There are plenty of guys with 460+ rwhp with stock internals with no issues..I think its all in how the car is tuned..I crappy tuned car with 350 rwhp wont last as long as a good custom tuned 450 rwhp in my opinion..Till these things start blowing up its really hard to say what the "limit" is..obviously 500+ rwhp is borrowed time..
thanks guys ... thats what i thought. Our dealership installed on a customers car (05 GT Mustang) with a Saleen blower on it .. different pulley ... bigger injectors ... custom tune ... putting down about 430 rwhp. Car is wicked fast and i own a GT500@553rwhp ...his is also a automatic ...