The aFe Universal fit 409 Stainless Steel Performance Muffler is designed to provide a deep, throaty, powerful sound on acceleration but maintain a smooth sound at idle. This muffler is constructed of brushed finished 409 stainless steel and uses a straight through perforated core with heat resistant packing to reduce backpressure and maximize exhaust flow.? You will see increased performance and improved throttle response over the factory exhaust. Muffler Specifications: 2-1/2 in. In/Out, Center/Offset 14 in.L x 9 in.W x 4 in.H