The stock clutch of your 1999 to 2004 Mustang GT can handle up to 350 horsepower before it starts to slip, but clutches that are already worn may slip even sooner. Don't wait for problems to happen, prevent them before they start and prepare your Mustang's manual transmission for serious power with a clutch kit from your friends at Stage 3 Motorsports. Some of our clutch kits can handle up to 800 horsepower and are perfect for extreme performance applications. If you want to fine-tune or prep even further, then grab an uprated flywheel that can handle even more horsepower and torque. With your clutch and flywheel squared away, check out our drivetrain upgrades or Mustang suspension parts to get even better performance out of your 1999-2004 Mustang GT.