HKS Spark Plugs to suit M157 5.5 litre BiTurbo engines. (set of 8) A noticeable difference...
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HKS Spark Plugs to suit M157 5.5 litre BiTurbo engines.
(set of 8)
A noticeable difference in performance over other brands.
Choose from standard heat range (Suggested for up to stage 2 vehicles) or colder heat ranges
Hot Plugs
have a longer insulator that prevents heat transfer into the water jackets. It keeps more heat in the tip of the spark plug, which helps burn off combustion chamber deposits. But if there's too much retained heat, the engine will experience preignition.
Colder Plugs
have a shorter insulator and retains less heat at the tip end are only required when higher boost levels cause increased cylinder head temperatures. If the plug is too "hot" pre ignition may occur. —but if it's too cold, deposits accumulate and eventually the plug will foul.
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