QA1 Engine Crossmember MUK01QA1's bolt in K members allow owners of 1979 1993 Mustangs to use the engine of their choice while enjoying the significant weight savings, increased header clearance, and improved geometry of a QA1 K member. Made from high quality American made HSLA steel, this tubular design is over 50% lighter than the stock K member, weighing only 25 lbs! Ideal for street performance, autocross, Pro Touring or drag racing, these K members maintain optimum anti
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