I have been playing with the stock file on my 15xp for a few weeks now, I have played with pedal settings, rpm limits, lower temps and all the normal things I can find people are changing. I am pretty familiar with HP in the automotive world, but was curious what people are finding with the stock limits on VE and Ignition? Where do these 900's like to end up for Air fuels, or spark advance? Any help would be appreciated, id rather not learn "trial by fire" unless I have to haha. I'm not looking at max effort stuff, just would like to have a bit more power than my buddies . Eventually I suppose if I need to I can run an AFR gauge into the exhaust I'm just not sure its quite necessary. TIA