[89IROC&RS]

well, you control the air that goes into your engine with the throttle, so thats already done for you. as far as your fuel curve, you can get the software to put on a laptop and custom burn your prom from the driver seat and have the same thing. but no, with a computer controlled car there is no way to turn a dial and change the fuel air curves, because its constantly changing with engine speed and load. the only thing i could think would be to somehow wire two PROM chips into the mount, have one programmed to be lean for best fuel economy, and the other rich for better performance, and have them on a toggle switch.