I run an RB26 HKS rail on my car, i recently purchased ANOTHER HKS rail as some idiots lost the HKS badge off mine after it had been powdercoated so long story short i purchased another HKS rail to steal the badge off it, the new one i purchased is to suit ER34 NEO and R34GTR, it looks almost identical to the one i have fitted so no idea what the difference is... It suits 11mm injectors to my knowledge. Mine fit as it was a forward facing plenum, the other HKS rail will be for sale if you need one.....