T304 stainless steel performance inspired resonator with a polished outside finish, perforated straight-through, stainless steel packed, high flow design. This resonator is sold without the "neck" to accommodate your particular project. They are packed with stainless steel wool in order to survive extreme heat applications such as those found on turbocharged, rotary, or endurance race applications. The steel wool packing will prevent melting or blowout which can happen with fiberglass resonators when they are used beyond their maximum temperature range. This resonator will help to reduce excessive noise, rasp, and drone. Features: Inlet/Outlet: 2.5" IDBody Diameter: 4.5" Body Length - 9" End to End Length: 10"Packing: Steel mesh