FlowTech Red Hots may be the best muffler value on the market today. The classic design includes thick, longlasting, high heat CeramaGlass packing wrapped around a power louver baffle. Backpressure is decreased to increase flow, help boost power and they sound RED HOT! Red Hots are only available in a rich red finish, In your choice of 2, 2.250 and 2.5 outlet diameters.