If u want a good boost of speed why not attach a small turbine to your car and make it swing on a pivot so u can silde through turns hey i got another idea why not run some NOS throuh the turbine as well!!! or just buy the Rhino turbine 39 pounds of thrust should give u a nice top speed but why stop there attack some big model rocket engines to it as welll maby 3 I's u will go faster that these rocket cars then http://mcneely.net/nrca/frame_events.html look at the Jean Dry Lake Bed, NV, February 8, 1997 read the peak speeds for the rocket cars WOW!! average 195mph peak of 400mph