This unique system is extremely popular on the grass roots racing circuits. It delivers exceptional power gains and has a motoGP or "traditional" look with the one side exit point. This exhaust is extremely light, and offers the amazing horsepower increases Graves is known for! The O2 Sensor Bung with plug is provided for use with Dynojet's new Auto Tune module which allows for live, closed loop EFI tuning. An adapter is available separately for use with the factory 02 sensor. Graves Motorsports' "Everlast" packing produces an exhaust note like no other and holds up longer to the extreme conditions of a high-reving motorcycle. This full exhaust system delivers big power, lasting durability, style and sound.