The Stage 2 engine chip for the E30 M3 is designed to work in conjunction with the High Performance Cam Sprocket optimizing performance and drivability. Dinan Performance Chips take full advantage of 91+ octane fuel unleashing additional power by recalibrating the ignition timing and air/fuel mixture parameters of the engine management system. Furthermore, the performance software safely raises the factory rev-limit, providing a broader power band and greater road-speed potential in each gear. Significant power gains are achieved at part throttle as well providing additional peformance where the cars are driven most often.