QA1 MUK21 Tubular K-Member for 1979-1993 Mustang LS Swap with Engine Mounts

The QA1 MUK21 Tubular K-Member is a purpose-built, bolt-in front crossmember engineered specifically for Fox Body Mustang LS engine swaps. Constructed from high-strength, low-alloy (HSLA) American-made steel and finished in black powdercoat, this K-member delivers a dramatic weight reduction along with improved front suspension geometry — making it an ideal upgrade for street performance, autocross, pro touring, and drag racing builds alike.

Weighing in at just 25 lbs, the MUK21 is over 50% lighter than the factory K-member, directly reducing unsprung front-end mass. All mounting points have been digitally indexed from new OEM factory K-members, ensuring a precise, no-drill bolt-in installation that retains the factory wheelbase. Included LS engine mounts make this an all-in-one solution for the engine swap.

Key Features:

• Bolt-In Design: All mounting points digitally indexed from factory K-members — no drilling required
• American-Made HSLA Steel: High-strength, low-alloy steel construction for maximum durability and rigidity
• Massive Weight Savings: Complete assembly weighs only 25 lbs — over 50% lighter than the stock K-member
• Increased Header & Oil Pan Clearance: Enhanced geometry maximizes clearance for easier installation and maintenance
• Modular Engine Mount Design: Bolt-in LS engine mounts can be swapped out for future engine changes without replacing the K-member
• Improved Suspension Geometry: Selectable rack height and optimal control arm positioning maintain anti-dive geometry and minimize bump steer, even on lowered vehicles
• Factory Wheelbase Retained: Bolts directly to factory components with no wheel or tire fitment changes required
• Black Powdercoat Finish: Durable, corrosion-resistant finish
• 1-Year Warranty: Backed by QA1's limited warranty against defects in materials and workmanship

For optimal handling results, QA1 control arms are strongly recommended as a companion upgrade. Sold as a single unit including LS engine mounts.