Allows easy adjustments to OEM Delphi fuel-injection systems to improve performance and match the requirements of performance partsMode and up/down push button switches make fuel trim adjustments in the rpm and throttle position ranges required by most applications; fuel trim value is displayed on a bright daylight-readable LED displayAdvanced mode (using optional USB Interface PART #2101-0075 and PC Link Tuner software) allows precise fuel adjustments and independent adjustments to the front and rear cylindersMay be compatible with other controller mapsEasy plug-in installation and setupCompact size only 4" L x 2" W x .5" HCompatible with Twin Scan II+ Tuning Aid install the Twin Scan II+ and ride the bike, then copy the air/fuel ratio corrections calculated by the Twin Scan II+ into the PC Link Tuner softwareMade in the U.S.A.NOTE: Not legal for sale or use on pollution-controlled vehicles.