QA1 Engine Crossmember MUK21QA1's tubular K members are designed to allow owners of 1979 2004 Mustangs to use the engine of their choice while enjoying the significant weight savings, increased header clearance, and improved geometry provided by a QA1 K member. , , This K member is designed for 79 93 Mustangs with an LS motor swap. Bolt In Design, All mounting points have been digitally indexed from new, factory K members., Made from High Quality American Made HSLA Steel, Weight
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