As featured in numerous magazine articles, this kit is the single best bang for the buck for your Series 1&2 Saleen Supercharged Mod Motor. 30 HP gains and up to a 3 PSIG gain in boost await you! 10 minutes to install. Chicane also offers a different pulley for the Series 4 and "E" series Saleen mustangs. Our pulley is a direct replacement for your original saleen pulley. You can reuse your original woodruff key and stock locknut on the Series 1&2 pulley upgrade. While there may be alternatives and smaller pullies available from other tuners, we have worked closely with and followed the supercharger manufacturers recomendation to avoid over revving the supercharger.