Spark Plug Gapper Tool Billet Include Feeler Gauge:Yes Fits all N55 Engines

Fits all N55 Engines

and adjustment The JB4 can also be stacked over flash tuning allowing for fine-tuning as well as water/methanol control with safety measures in place and full logging

but under boost pressure they open up leaking the desired charged air into the engine bay

and VALET/low boost mode

Spark Plug Gapper Tool Billet Include Feeler Gauge:Yes Fits all N55 EnginesThis precision tool is critical to properly and accurately gapping spark plugs. With this tool you will be able to gap plugs faster and maintain accuracy. Available in 14mm and 12mm plug thread sizes. Made in USA. The optional specialty spark plug feeler gauge has 4 blades in . 018, . 020, . 022, . 024 thicknesses.