i think keeping your car nice and tidy would be a good thing. have every led wire all strapped up or coiled up, dont just shove them inside slots in your car, think before you wire up your batteries and motor, which way would look the tidest. usually looking at adds and pro drivers, you could know whats the best way of wiring!
as for upgrades, get stuff that would improve the cars handling, not to make your car looks good, Al arms and C hubs are overkill, not only they bend when you crash and its a bitch to straighten, its 10 times heavier as plastic.
what did i miss?