Cobra Fi2000 PowrPro Tuner Digital Fuel Processor for 2012 Harley Davidson FXD New patented technology unlike any other auto tune system on the market Tunes to exactly what air-fuel mixture creates the maximum power 80 times per second (does not tune to some arbitrary AFR someone has picked) Creates that adjustment to maximum power on every squirt of the injector It is like having the best custom map writing, dyno operator tuning your fuel every time you crank the throttle Tunes every gear, every roll on, every environmental change, every engine modification, lugging the engine, winding it out to redline: it reacts, verifies and adjusts