Automotive Modification Advice

Here is a random generalization of mods to consider for your cars and trucks:

Cars:
Exhaust, muffler, intake, lowering springs, coilovers, body kits, aftermarket headlights and taillights, HID lights, spoilers, hood scoop, wheels or rims, performance tires, interior and exterior design, turbo or supercharger systems ,etc.

Trucks:
Exhaust, muffler, intake, lift kits, springs, shocks, shackles, blocks, radflos, spindles, control arms, traction bars, body lift, aftermarket headlights and taillights, HID lights, hood scoop, wheels or rims, off-road tires, interior and exterior design, tow packages, bed liner, bed cover, etc.