No matter what they claim, aftermarket systems come down to one thing... How is your engine built? Thats it.
Full Self Tuning is great for high idle vacuum mild engines.
Full self tuning sucks, I mean you will want a carb again sucks, for low idle vacuum angry engines.
Big cam overlap down low can not be self tuned. Full wide open short exhaust down low can not be self tuned.... See the theme. All has to do with exhaust reversion, cam overlap, unburned fuel.... All show lean no matter the actual AFR. Ever see a rig run sooooo rich the O2 shows its lean?
I'm not hating on any kits, I am simply expressing what I have run into and what other guys have run into. Everything is awesome on the flyer! When it comes to real world, not so much. To me its like guys that claim they are tuners and they stick a wide band in the tailpipe....... Ain't gonna work.