The Endo Spark Arrestor Endcap is machined from 6061 billet aluminum and attaches to the stock exhaust pipe, offering a reasonably priced alternative to buying an expensive aftermarket exhaust system.  Also available, is an optional, bolt-in, Silent Insert and Ultra Silent Insert that lowers the sound level by over 5 db. You may feel a small loss in top end power, but in sensitive areas, keeping noise down is a must!