My son loves the Performer RPM on his 400 Dart. It ran a tad quicker then the Street Dominator did by about a 1/2 a tenth even though it had less mph then the SD. The 1/8 and 60 ft were much better with the RPM and it was enough to keep the 1/4 et quicker then any single plane he tried and the SD was the best single plane on his Dart. He will never go back to a single plane on his combo he says even though I have out 60 ft him with the SD on my 63. But honestly Andy is so right as the RPM is great for a mild street/strip car. Ron