GM Genuine Parts Exhaust Muffler Gaskets are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These gaskets help ensure a tight seal between your vehicle's exhaust muffler and adjoining components, and helps guide exhaust to the exterior of your vehicle. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).