If you wanna win, get some tungsten weights!
This is a pretty versatile set, and likely exactly the set you need if you are "maximizing" your car.
They are quite heavy for their size to bring the cars weight to 5 oz.
Maybe Last year, your car was one of the slowest.
However, by having this 4oz Cylindrical Tungsten Weights & Putty Kit.
This year you have the chance to be the best.
Everyone knows they wont be beat because of the time and effort they spend.
Good luck, see you at the finish!