STM Spark Plug Gapper Tool Select::12mm Gapper Tool "A" (advance) and "R" (retard)

"A" (advance) and "R" (retard) directional markers are also laser-etched on to the cam gear face

340LPH @ 73 PSI (30 psi boost)

STM-DSM-EVO-DSCB-1

The rear opening on the JDM covers is just a touch bigger than the USDM

STM Spark Plug Gapper Tool Select::12mm Gapper Tool "A" (advance) and "R" (retard)The STM Spark Plug Gapping Tool allows for easy handling of your spark plug and gauge for for a smooth, controlled and precise gap. So you can stop banging your plugs on random hard surfaces! Please confirm the thread size for your plugs before purchase. Vehicle Fitment: For 12mm or 14mm spark plug threads See fitments below Features: USA made Billet aluminum Super easy to use tool 12mm Gapper Tool for: Mitsubishi Lancer Evolution X Nissan R35 GT R