C&L Performance - 07-09 Mustang Shelby GT500 SCT X3 & C&L Intake optional 2.59 pulley Package deal with C&L Intake and VMP Custom Tuned SCT X3 Handheld Flash Tuner. Optional: add a VMP 2.59" pulley and 90MM idler. Intake and tune alone results in a 60-80RWHP and 60-80RWTQ gain, peak numbers will be 510-520RWHP in very good conditions, and 490-500RWHP in summer conditions (100F+). Smaller 2.59" blower pulley (stock is 3") adds 3-4psi and 30-40RWHP and 30-40RWTQ. Peak numbers with pulley will be 550RWHP in good conditions and 525RWHP in summer conditions (100F+). The 07-09 Mustang Shelby GT500 is the most powerful production Mustang Ford has ever produced. The GT500 has an amazing amount of potential waiting to be unlocked. With a safe 93 octane tune we picked up 60RWHP and 40RWTQ! Stock the GT500 will dyno at 420-460RWHP and 440RWTQ SAE corrected on an industry standard Dynojet. With a 15% drivetrain loss that is 500-520HP at the crank.