plus abone stock blaster has like a million resrictive things, that were put there for kids. if you bupass all the bullsh*t on the blaster and set it up good, they do just fine keeping up with a 400, the throttle setup on a stock blaster is all adjustable, open that beast up and get rid of the speed limiter and all those tors and carb switch, there all things that go wrong and slow up the process, get rid of the oil injectin, and mix your gas properly, blasters were designed for beginners and they were made to be able to advance for cheap as the skill of the rider gets better, and the more you build it the faster it gets, but mine beats all kinds of 400s and keeps up with 450s some, and it always has kept up with 400s.