Sway Bars (Front + Rear)

Adjustable sway bars deliver the biggest handling upgrade for under $500: they cut body roll by up to 50% compared to stock bars, without sacrificing ride comfort over bumps like stiffer springs do. Unlike #10 polyurethane bushings that only fix deflection, sway bars let you actively tune cornering balance — a stiffer front bar adds understeer, a stiffer rear adds oversteer. Data from Whiteline and Eibach confirms that cars with aftermarket sway bars achieve up to 0.05g higher lateral grip on skidpad tests. For the price, this mod outperforms #8 in cost-per-handling improvement, offering race-car adjustability for street driving.