FMF Racing Q Spark Arrestor Silencer , Color: Natural, Material: Aluminum 020493 U.S. Forestry legal spark arrestor muffler system will meet the 93dB sound level set by the forestry service The quietest 2-stroke legal performance spark arrestor made Longer oval canister uses internal technology that retains optimum flow characteristics, which are designed to enhance sound absorption qualities Superior sound deadening characteristics and excellent power The Q will help ensure that we stop noise pollution, not rob power