Tony, I thought it was true as well that the AFM doesnt do anything above 3500rpms. Although When I tested this.. I got something different. using 311CC injectors I tested the stock AFM. at wot and 13psi I was getting a nice 11.8 air/fuel, I then tightend the spring 5 teeth. and then was a nice 14's cruising and when I went WOT it was leaning out bad. I returned the afm back to stock and it runs like it did before. Nice 11.8-12.0 at WOT.. but cruising is around 13's or so. I sure cannot wait to play with MSnS..