mygt500

You should be fine with the stock internals for now. If you plan on beating on the car often and tracking the car and hook well I think you will shorten the life of the motor in the long or short run. You can't predict that. The stock bottom end should hold for 450RWHP and many are fine with that and have been running well ever since. I have over 454 RWHP and have no worries at this time about the motor. I plan on going with more PSI and meth in the future and will be getting forged internals (pistons, rods, and a slightly different CAMS). I am looking to get 550+ RWHP w/ the forged internals. So like Hammeron said it is up to you and is a personal decision on what you wnat to do with t e car in the long or short run. Tune is everything and get gauges to watch you A/F ratio, fuel pressure, and boost pressure. Others will have different opinions but this is mine. Hope it helps!