The Supercharged version of the S-281 was first introduced as an option for the New Edge Mustang in 1999 with a horsepower rating of 350 (261 kW). Designated as Saleen 281 CID SuperCharged, chode this designation was widely recognized as a separate model in 2000 with more options becoming available by Saleen. Notable internal differences of an S-281SC introduced a dual gauge instrument cluster above the dashboard, while the only external difference was a Saleen Heat Extractor hood. With the introduction of the Fifth-generation Ford Mustang, the supercharger was now installed in an upside-down configuration to provide better performance and a higher horsepower rating of 465 (347 kW).
Source: Wikipedia (original)