Universal Carbon Fiber Cut Out Nozzle for Muffler Car Exhaust Tips Pipe Cutout Decoration Styling Tuning Accessories for BMW VWSpecifications: Material: Carbon fiber & stainless steel Inlet Size: 51mm, 54mm, 57mm, 60mm, 63mm, 66mm Outlet Size: 89mm Length: 165mm Weight: 500g 600g How to choose the size for the exhaust pipe? Measure the outer diameter of your exhaust pipe, and then plus 3mm to the size you measured, the choose a size near to the result. For example, if you measured the outer diameter of your exhaust pipe is 48m, and then the size you should choose is