3 inch inside diameter inlet, 4 inch outside diameter outlet, 12 inch overall length.Clamp on design, Easy to install, No weld needed, No drill needed. NOTE : It will fit 3 inch outside diameter pipe, will not fit 3 inch inside diameter pipe.Durable black exhaust tip, protect your original pipe from the and rain, avoid rusting and deformation.Protect the original exhaust pipe from and rain to prevent rusting and deformation. Looking: The black painting finish, elegant and mysterious, perfectly decorates the tailpipe of your car.Protect the Original Tailpipe:Protect the original exhaust pipe from and rain to prevent rusting and deformation. Looking:The black painting finish, elegant and mysterious, perfectly decorates the tailpipe of your car.Step 1: Clean the surface of your tailpipe.Clean the dirt and sand on your tailpipe with penetrating oil and a shop .(Make your tailpipe is at room temperature, and do not clean the surface of the tailpipe after the car just went out): Slide the exhaust tip into your tailpipe.Try to slide the exhaust tip into the tailpipe. You may some resistance, so, if necessary, use automotive grease to lubricate the pieces if necessary.Cover of the exhaust tip with a towel and tap it into a place with a rubber mallet.Step 3: Fasten / weld the exhaust tip.Tighten screws and to secure the exhaust tips. Should you worry that it is not tight enough, you can weld a joint between the edges of the tailpipe and the exhaust tip.Then, the installation is complete.Colour: blackMaterial: stainless steelSize: 3x4x12 inchPackage Contents:1 * Exhaust TipNote: measure the size of your exhaust pipe prior to purchase of this exhaust tip.Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.