Product details:

With no muffler, the full fury of your engine will be heard by everyone in the vicinity. So you'll want to reserve this system for racing only, used off of public roads. Race trucks have different needs than street-driven cars; driving sedately past a Law Enforcement officer isn't one of them. If you have an all-out race truck, this exhaust system will deliver ultimate performance, and plenty of glorious noise. With constant-diameter bends done on a mandrel-bending machine, and minimum bend angles engineered in, it flows far more freely than any street exhaust system could. Dimensions: Main Piping Diameter: 4".