Race Car Wiring Kit - Welcome to the MegaHobby.com model car section. We stock thousands of model cars in various cateories, in addition to aftermarket detail parts to make your model look like a true showstopper.. Click on picture for larger image. RJSpeed Spec Sprint Car Kit 1/10 Scale . Description: Kit less electrics includes composite fiberglass chassis kit with adjustable rear suspension, nylon roll cage, ball diff, spec times, 4pc. sprint car body and wing kit..