Wow, I borrowed a sportwerks .21 with a jp3 pipe and racing clutch to get more speed, now i can't control the buggy, too much power. I think the driver needs more tuning ha ha. I don't know which of the three changes was the most dramatic but i'm leaning on the clutching, We have a technical track that is dry slick at the moment of testing. Gonna try different tires for traction.