Weistec Spark Plugs M156

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.