The compressor is either mechanically driven supercharging or exhaust driven turbocharging. Forced air induction by turbocharging and supercharging have increased power outputs and engine efficiencies. The method of turbocharging and supercharging an engine is referred to as twincharging. Turbocharging substantially increased horsepower, from and torque from . Both engines featured computer-controlled fuel injection and turbocharging. TVR contracted the company Broadspeed to develop a turbocharging system for their TVR 3000S Turbo. This shift to turbocharging and smaller engines was reflective of general automotive industry trends. Common-rail direct injection, turbocharging and four valves per cylinder are standard. Due to the presence of turbocharging, the N63 does not use a variable-length intake manifold. Once above notch # 5, the engine uses true turbocharging. Performance levels have been maintained, however, by improving turbocharging efficiency. It was made to celebrate SAAB's 30 years of turbocharging. The advent of turbocharging however hastened their adoption, by permitting greater power densities. Tett described how the team developed new securitization techniques for "turbocharging the market". The smaller stack is due to the lack of turbocharging.