Control arms allow a car to corner appropriately, absorb bumps, and make turning and braking more precise. If a control arm is damaged or worn out, it can cause various problems, such as wheel ...

04. Behold the tubular upper control arms from QA1 (PN 52318, $450). Fully TIG-welded, these arms add 3 to 4 degrees of caster and 0.5 to 1 degree of negative camber when paired with their lower arms.

Where the control arms connect with the steering knuckle, both upper and lower control arms use burly 1.5-inch uniballs in place of the stock ball joints-much stronger.