For those who will be making over 630bhp these uniquely designed spark plugs are a must have. The extended electrode tip of the OEM spark plug will be prone to pre-ignition at higher power and boost levels. Upgraded spark plugs are a must have with our Stage 2 and 3 Supercharger packages.

KEY FEATURES:

• Higher Output for Supercharged applications

• Colder range for better compatibility in supercharged applications

• Direct replacement/bolt in for M156/M159

• Inexpensive way to gain power and efficiency

• Increased overall safety of engine parts

• Set of 8

* Important: Please be sure to check and set spark plug gap prior to installation.