Fi2000 O2 Fuel Tuning Module For Harley If you add a set of pipes and an air intake onto your bike without adjusting the tune, there is a real good chance that you are running lean. The Fi2000 Tuning module is a simple plug and play solution to bring your bike back into an optimal state of tune that doesn't require a computer or smartphone app. With an Fi2000 Tuning Module installed you can expect better throttle response, minimal backfiring, and smoother rideability all around! Features: No confusing computer downloads to install No cutting, tapping, or splicing needed Pre-configured from the factory for specific models Low, medium, and high speed adjustments for custom tuning Detailed instructions included Waterproof circuit board Note: Closed loop design requires O2 sensors to function.