PORSCHE 924S SIGNSCan't find what you need? Try browsing the Accessories or Exploded Diagrams!Filtered by: 911 1987-89 - Accessories (includes uncategorized and accessory items) 21011123 Catalytic bypass pipe "x torque" design made by m&m in Germany. The x torque design in is a true x pipe design. It is open in the center to add backpressure for torque. Give's you 10-15 ft-lbs of torque in the mid range along with 10-15 hp in the higher rpms. Why settle for the traditional cross over cat design when you can add torque in the mid range where the 996's need it most! Dme programming is necessary. Without it you will get a check engine light (cel). Tech tip: for older cars repair-kit FVD mk 996300
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