Packed Baffle Insert for RoadsterSport Miata Muffler Proudly made in the USA All stainless steel parts means years of quality performance and all the stainless parts have a lifetime warranty Glass Packed baffle insert for RoadsterSport 3 Mufflers only. Sorry, does not fit older RoadsterSport 1 or II, RoadsterSport Race, or any other muffler. This is for folks that want to bring the sound DOWN for longer trips, etc. Uses same retaining screw as stock baffles. Each unit is about 7 inches long and acts like a small additional muffler that slides into the tip of your RoadsterSport.