Ok, so in the process of researching exhausts I started reading about AFV values and how it will fluctuate depending on altitude and other factors with fuel, injectors, seals, etc. I checked my afv last week and it was at a 89.2%. Now I know you want it as close to 100 as possible and that if your within 10 either way you should be good. Wondering if I change mine to 100 and burn(save) the change A) will it screw anything up on ECMSPY in terms of my maps etc. I have the stock saved, thats one of the first things I did. and B) will the bike run any different but then revert back to what its used to or will it relearn for this altitude and change for better or worse? Ive searched and read through all the AFV stuff I could find on the forum and nothing really answered these type of questions. And also so I understand below 100 is rich and above is lean? Thank you.