As part of Tuner Category, this is where much of the “tuning” comes in. Here you can change ride height through suspension adjustments and some other items, you can replace suspension bushings, if you keep the ratio of rubber to metal the same. You can also install either camber plates, or camber bolts, or adjustable control arms—but not more than one of them. We also let you replace a non-adjustable arm with one that doesn’t adjust, if it’s available at the Tire Rack or on the list below.

For the rear-wheel-drive folks in Tuner Category, we have some allowances just for you as well; things like traction bars, stabilizers, Panhard rods and differential covers.

This one has some complication to it, so if you’re really getting crazy with suspension, it’ll pay to give the full rules a good look.