Fuel-Pack FI2000R Power Pro Cobra 12-17 V-RodCaracteristicas: PowrPro Black analyzes, tunes and adjusts your air fuel ratio for peak performance instantaneously Can tune engine fuel delivery in specific ranges, check rpm, read fuel injector pulse width and duty cycle, and add or remove fuel in low or mid range rpms Works with stock or modified engines, air cleaners, and exhaust systems Tunes acceleration fuel delivery in every gear for peak performance Can fine tune the non acceleration air fuel