Universal Spark Plug Gap Tool w/ Feeler Gauge 118i (F20/F21) more aggressive engine sound that

more aggressive engine sound that adds excitement to every drive

To increase wastegate dutycycle the BCM add on harness is required

New rubber pan gasket and suction filter included

The JB4 also does not require any user setup or customization but for more advanced enthusiasts the BMS DATA cable allows you to connect via a laptop for data logging and free software updates

Universal Spark Plug Gap Tool w/ Feeler Gauge 118i (F20/F21) more aggressive engine sound thatThis 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. The optional specialty spark plug feeler gauge has 4 blades in . 018, . 020, . 022, . 024 thicknesses. Universal tool for gapping your spark plugs. A must for installing any spark plugs!