Enhance your tuned 135i, 235i, M2, 335i, or 435i N55 engine with these NGK advanced iridium IX spark plugs. Designed one heat range cooler than stock plugs, they offer optimal heat dissipation and stable spark performance for modified engines.Seamless bolt-on installation Available in a set o..

Enhance your BMW 135i E82 or 335i E9x with these NGK high-performance iridium IX spark plugs, specifically tailored for heavily modified N54 engines. Offering two heat ranges cooler than the standard OEM, these spark plugs deliver superior heat dissipation and stable spark performance, ideal for sta..

Enhance your modified BMW M3/M4/M2C S55 engine with NGK's top-tier iridium IX spark plugs. Designed one heat range cooler than the standard OEM, these spark plugs deliver exceptional heat dissipation and consistent spark performance for tuned vehicles.Seamless direct-fit installation Availabl..