The new Super-Flow 4" system for your H-1 is designed and engineered to optimize engine output and to deliver an exhaust note that 'fits' the big Hummer. Engine lovers will delight at the big, bold exhaust note and will enjoy the sweet, singing sounds of the turbocharger spooling up and down.
This system is thoughtfully designed to produce this big, powerful sound while it maintains a quiet passenger cabin. With the windows raised, the interior sound is as quiet as originally intended. Lower the windows and you can bask in the beautiful sounds. For maximum engine efficiency, complete your H-1's exhaust system with our optional 'Off-Road' pipe. The Off-Road pipe is specially designed to replace that restrictive component located just forward of the factory muffler assembly.