Tracks all over North America now require racers to install some form of sound reduction equipment on their race vehicles. Vibrant Performance Race Mufflers are designed to help reduce noise levels produced by high performance vehicles. They feature Vibrant's unrestricted "True Straight Through" perforated internals to avoid performance loss. Our new 5" long Race Mufflers share all the same features of our standard 9" long mufflers and are intended for use on applications where space restrictions make it impossible to install the longer mufflers. Muffler Specs ------------Inside Diameter: 4.5" Outside Diameter: 5.125"
