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The Porsche 928 was designed for a dual exhaust from day one.  The factory started putting dual exhaust on all 32V cars.  While the factory syste, works great on cars that have decent power levels, the system is not up to the task of flowing big power numbers.  We do offer the service of a hand build custom 3" dual exhaust for use with the twin turbo system.  These exhaust systems utilze the Borla XR1 mid mount resonators and high flow Random Technologies race catalysts.  Built from mandrel bent and tig welded 304 stainless steel in 16ga for ultimate longevity, these systems will last the life of the vehicle.