The design removes the stock pre-muffler, where the stock catalytic converter is located, allowing less restricted gas flow to aid performance in the mid and high rev rangeFor use on closed-course tracks and racetracks onlyRemapping of the ECU is recommended to get the optimum performance from this ..
Titanium link pipe for low installed muffler (must remove pillion passenger frame to install and aluminum muffler holder from BMW's accessories range (BMW product code 77 11 8 564 071) must be mounted, and covers for the main frame's threaded fasteners (BMW product code 77 25 8 536 857) are also rec..