well, tt-01 is just a general name for the tt-01 series i guiess. you can buy a tt-01 and upgrade to the exact specs of the D...i have the tt-01 kit and it drift right from stock (you need to put some ABS pipe on the rims to dirft bettter)...of course you can always make it drift better by installing BB, aluminum prop shafts, oil filled shcoks..etc