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I believe what I did was: Remove factory narrow bands. Installed o2 eminators on the honda harness Loop the o2 sensor connections on the Rapid bike harness. Definitely don't throw your factory o2 sensors away, just in case that doesn't work. For the engine brake settings, I based my settings on my AFR readings on the Youtune display. Each gear needs slightly different adjustment, but since we do not have a gear input on the VFR harness, I tried to do the best compromise for each gear. I will have to double check my settings, but I think I had it around 50%, so closed throttle deceleration would stay in the 13-14:1 range. You definitely don't want to get much below 13:1 AFR, as you will be wasting gas and far too rich and you don't want to be much above 14:1, as it will not be effective. You're welcome Stray. Yeah 4 my tuning bikes is great, but a bit excessive. The Rapid Bike Racing ignition maps were created to run on Mid-Premium octane fuel (95 Euro; 91 US). The 5th gen VFR800's ignition mapping is pretty optimized from the factory, so there is not much more ignition advance that can be safely added. If you ran 98, you could maybe add 0.5-1.0 degree of advance on top of the rapid bike base map, but I would only do it while tuning on a dyno, with some means of knock detection and by a professional.