This system is cat back for a 01-05 GM 6.6L Duramax Diesel. This is a 4inch aluminized exhaust. It goes from the cat back to the tailpipe and will come with every clamp and hanger you will need for installation. With this kit you will see a gain by up to 2 mpg better fuel mileage and lower exhaust gas temperatures by up to 200 degrees. For any other info please e-mail or call
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