FMF Racing 4-Stroke Replacement Packing Pillow

FMF Racing is well-known for making high-performance exhaust systems for off-road motorcycles. This replacement packing pillow is designed to go inside their 4-stroke mufflers, helping to keep them performing and sounding their best. It’s essentially the material that dampens the sound and manages the exhaust flow within the muffler core.

This packing is made from fine, blended, interwoven fiberglass fibers. FMF specifies these materials to ensure they can handle the high heat found in a 4-stroke exhaust system. The interwoven design helps with sound attenuation, meaning it’s effective at reducing noise, and it’s built for optimum performance and longevity. When your FMF muffler starts to sound louder or less refined, replacing the packing is a common way to restore its original characteristics.