HKS M40IL Series Spark Plugs
HKS M40IL Series Spark Plugs

HKS M40IL Series Spark Plugs


These are 2 steps colder in heat range compared to stock EJ257 spark plugs.

These spark plugs are brand new, and only removed for product picture purposes.

Heat range: NGK (8) 2 Steps Colder

STI Stock Heat Range: (6)

Manufacture Set Gap .26

Fitment: EJ257