Superlift’s 6-inch suspension system for current-model F-150 4x4s passes FMVSS 126, NHTSA’s highway-speed lane-change test that verifies electronic stability control (ESC) functionality: The kit is fully compatible with Ford’s Roll Stability Control and Advance Trac traction control. Component highlights include cast ductile-iron knuckles that don’t increase front track width. High-clearance front crossmembers are tied together by a skidplate. Superlift uses rear blocks to retain factory spring rate and ride. Shock choices are affordable Superide or premium Superide SS by Bilstein. For more information, contact Superlift, 800-551-4955, www.superlift.com.