When you start to get close to 500 and your launchin it,then they start to break in half.Drag strip launches bring a quick down fall with meats in the back,I think closer to 550 600 hp if your on stock tires.You may even break it in two at 400- 450 hp if you have moster meats.Lots of these at about 400-550 hp on the street with turbos or superchargers that live along time because of the standard stock type tire size and few launches from a dead stop.