The Billet Performance Products Nissan RB R35 coil conversion kit is designed to replace factory RB coils with genuine Hitachi R35 GT-R coils using a billet adapter for a cleaner, more reliable ignition setup. It is a proven upgrade for RB engines where older factory coils become a weak point, especially on boosted street cars, drift cars and track builds. It also suits fresh engine packages being assembled with aftermarket ECU control and upgraded ignition hardware from the start. Features Fitment: Nissan RB20DET, RB25DET non-NEO and RB26DETT Coils: Supplied with genuine Hitachi R35 coils Adapter material: 6061-T6 billet aluminium Function: Converts the engine to R35 GT-R ignition coils Colour options: Black, Blue, Purple or Red Typical Applications Street and performance RB builds replacing tired factory ignition coils Boosted RB20, RB25 and RB26 combinations Drift, drag and circuit cars using aftermarket ECU control Engine builds where ignition reliability and serviceability are being upgraded together Fitment Notes Suits Nissan RB20DET, RB25DET non-NEO and RB26DETT engines Adapter retains original coil height Works under RB20 and RB25 coil covers; original RB26 coil cover clearance should be checked carefully Confirm wiring and ECU requirements before installation