yea, the BUNG-HOLE Sumo exhaust is the real high-perf. system....the O2 bung allows for constant viewing of the a/f ratio in real-time so you can adjust on-the-fly w/a WideBand PC IIIusb. Its great if you're racing in different conditions, but if you stick to one area/elevation for most of your riding-there's no point to having this.
I wont be racing this thing EVER again, so dint make it onto my "must have" list...just that puuuurrrty can!
I wont be racing this thing EVER again, so dint make it onto my "must have" list...just that puuuurrrty can!