Replacement CRV / BOV spring for the EFR turbochargers with standard spring rate. BorgWarner EFR Turbo BOV Spring - 58061191379 EFR Internal Blow Off Valve Spring as Replacement for EFR Turbocharger Genuine BorgWarner Replacement Part NOTE: This is the BorgWarner EFR BOV spring with standard spring strength. The stronger version has the part number: 58061191364 and is without any color marking. Replacement spring for internal SUV (diverter valve) or BOV called. Genuine BorgWarner spare part if the old spring has become slack due to age or has been lost during a repair. Fits: All EFR turbochargers with integrated blow-off valve on the compressor housing. - EFR6258 up to EFR9280 Color: Blue