Get the competition kit (programmable ecu and throttle stop screw) sold together for $100. drill out the oem muffler restrictor (pea shooter), and get the mapping reset (by dealer) to FMF map. You can fit a bigger muffler tip on the oem muffler (same one that fits older WR's), and you'll be set. I can rent my FI tool to you for resetting the CO level to make it run even cooler. PM me when the deal is done.