NGK - Racing Spark Plugs R2558E-10 (97278) z4 Series 7 S is the

Series 7 S is the short offset with the wider late model 4 stud Toyota base

attaching from the pressure regulator output to the hardline

NVH Increase: NA

Custom valving and springs rates are available by request

NGK - Racing Spark Plugs R2558E-10 (97278) z4 Series 7 S is theWhat's firing your engine? NGK racing spark plugs are built to withstand the severe mechanical and thermal shock associated with high revving, high compression engines. NGK racing plugs feature special electrode materialsprecious metals like platinum, iridium, and rutheniumfor greater durability and low voltage requirements. Fine wire center and ground electrodes provide better sparking and enhanced ignitability. And, the unique arrangement of