Radium Fuel Rails, Subaru & Toyota FR-S/BRZ/86 The Radium Engineering fuel rails are designed for the 2013+ engine found in the Subaru BRZ (FA20D), Scion FR-S (FU-GSE), and Toyota 86 (4U-GSE). Manufactured with a large 0.69″ internal bore, the fuel rail can support all necessary engine power requirements. The left/right rails are identical and feature anodized aluminum bodies and mounting brackets. The Radium Engineering fuel rails are designed for the 2013+ engine found in the Subaru BRZ (FA20D), Scion FR-S (FU-GSE), and Toyota 86 (4U-GSE). Manufactured with a large 0.69″ internal bore, the fuel rail can support all necessary engine power requirements. The left/right rails are identical and feature anodized aluminum bodies and mounting brackets. This does not include hose or fittings. This does not include hose or fittings.