I run a 621t in buggy and truggy and let and let me tell you this engine has more all around power than anything ive ever driven there wont be any jump someone at the track is making and you just dont have the power to do it, that wont happen with this engine believe me its got plenty. And on top of its power its got good runtime around 10min in both buggy and truggy. If you havent checked this engine out you are definately missing out on something great engines lasting 12 gallons for $280 with tons of power and good runtime definately a winner.