I weep for the future.
Pathetic we got so many rice wannabies here. Guess some people took the fast and the furious to seriously. Oooh they beat a ferrari. (Note that the ferrari they beat was the slowest model available.) The things you do in this game do squat for performance on real vehicles. Wings/spoilers will only help if your vehicle is exceeding 190mph. Fart cans do nothing but draw attention to the vehicle, lowering your vehicle can help with performance if done right, and the list goes on. Not worth the time and there are already a lot more of these customize car games on the net.