Complete system including header, exhaust can, piggyback wiring harness, RapidBike tuner, and servo buddy (fools bike that exhaust servo valve is opening and closing). Saves quite a bit of weight, deletes CAT, and increases power. It was on the bike for about 1000 miles before I bought it, but I've already got significant hearing loss (retired helo pilot) and it was just too loud for me. It did occasionally cause a check engine light riding over 8000' altitude; but it ran great and the light went out back below 5000'. The bit code indicated O2 sensor fault but both sensors were OK.