DOUBLE WALL CLOSED OUTER CASING. WITH BLACK ANODIZED ALUMINUM BILLET. INLET DIAMETER - 2.25 INCH.OUTLET DIAMETER - 4.00. OVERALL LENGTH - 7.5. See my store for more Aero, Bendix brakes, Converters, Mufflers, MagnaFlow, K&N, and DEWALT. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts & Accessories\Exhaust & Emission Systems\Exhaust Pipes & Tips". The seller is "alabasterboxflorals" and is located in this country: US. This item can be shipped worldwide.