NGK 4091 R5671A-7 NGK Racing Spark Plug

NGK (635) (635) R5671A-7 NGK Racing Spark Plug NGK Racing Plugs Are Designed For Use In Engines That Have Been Tuned To Achieve Maximum Power Under Specific Extreme Racing Conditions. These Spark Plugs Are Available In Various Designs & Configurations To Meet The Needs Of The Particular Engine.