If you have a ROUSHcharger®, turbocharger or other supercharger system on your Ford Mustang or F-150, it’s pretty evident that you are a performance driver. So, naturally you will want to get the most out of your vehicle, which makes the ROUSH® Performance Colder Spark Plugs a must for supercharged, turbocharged and nitrous applications.

These Colder Spark Plugs are designed for the Ford Modular three-valve engines (4.6L and 5.4L), including those found in the 2005-2009 Ford Mustang GT and the 2004-2009 Ford F-150 with the 5.4L, 3V engine. This is the same spark plug that is installed in the Stage 3 ROUSHcharged™ Mustang and F-150 packages.

The need for installing a colder spark plug is to prevent pre-ignition and detonation of the fuel due to the higher cylinder temperatures found in the supercharged engines. Pre-ignition is typically caused by many factors, such as an overheated spark plug tip which acts like a glow plug to ignite the charge. This puts a tremendous load on the engine and adds considerable heat, a recipe for serious damage.

These ROUSH Performance Colder Plugs are one heat range colder than the stock Mustang plug and are designed specifically to handle the high boost pressure and air flow into the engine. The gap on these plugs is 0.045 inches.

Since being established in 1976 as Jack Roush Performance Engineering, ROUSH® has become the winningest name in racing, with numerous championships in professional drag racing, road racing, and NASCAR. The ROUSH company is also recognized internationally as a premier provider of automotive product development and systems integration solutions, with more than 2,000 employees in facilities across the globe. The company's success remains deeply rooted in the core values that are unique to ROUSH: reliance upon the talent of the individual, a disciplined work ethic, scrupulous attention to detail, and an acutely intense desire to be the best. As a result, every ROUSH product shares in this rich tradition of racing performance and the highest level of OEM quality and design.