HGS muffler for the 2005 to 2016 Yamaha YZ125. HGS Exhausts are used by champion riders all over Europe and the world to increase performance in all types of track conditions. This high quality hand made exhaust provides an increase in performance in the mid range of engine RPM speeds. As a Dutch manufacturer HGS are very conscious of high running temperatures due to the infamous sand tracks of Holland. HGS are continually working towards maximum performance.We have fitted and ran many HGS systems over the years and the build quality (all hand made in Holland), fitment, reliability and performance is second to none! So if you want a system that actually works and not just looks good this is the system for you!