The Aeroflow Performance RB25 fuel rail is specifically designed to suit the Nissan Skyline R33 with the RB25DET engine. Will NOT fit NEO engines. Proper fuel delivery is arguably one of the most critical components for those looking to make all the power they can safely. The RB25 OEM fuel rails are incredibly restrictive and impede the fuel delivery to the injectors under high fuel pressures. This is problematic for high power RB engine builds where having consistent fuel pressure is absolutely necessary. Manufactured with a large 18mm internal bore, this fuel rail can support all necessary engine power requirements, especially with three -8ORB ports fitted along the fuel rail. Designed to suit 14mm fuel injectors in either short (33.6mm) or 3/4" (48.5mm) length with two different length billet spacers included depending on application and intake manifold used. and available in either black or silver anodised.