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The stock Mustang rear suspension, like most factory components, was designed as a compromise around ride, handling, and how much power the stock vehicle will produce. For us, it simply isn't enough! PHR's project Mustang is receiving Maximum's complete Torque-arm Suspension System, which further includes Maximum's Panhard bar and rear lower control arms, which were specially designed to absorb the punishment of dragstrip launches. New rear springs were selected to maximize the dramatic increases in cornering grip and straight-line traction. Maximum's engineers determine the rear spring that best complements the front-spring rate of a Mustang outfitted with the Torque-arm System, which corrects the weaknesses and inefficiencies of the stock Mustang by converting it to a three-link suspension that greatly increases traction off the line and in the corners. Unlike other designs, the Maximum Torque-arm maintains acceptable ground clearance and exhaust clearance, plus full access to the differential cover. Two versions of the Torque-arm are offered. The standard package (pictured) accommodates engine-torque outputs of 300 to 590 lb-ft; Maximum's heavy-duty model is rated for 475 to 900 lb-ft. The correct system for any individual vehicle is determined by a combination of its engine torque and final-drive ratio.