Manley Subaru WRX/STI 16pc Valve Springs (1.050/.755) (for use with 23180-16 Retainers)
Ferrea 17-18 Audi 2.5 TFSI Single Spring Kit
Ferrea Acura K20 High Lift Drag Racing Dual Spring Kit
Ferrea Honda Type-R K20C1-Turbo Single Spring Kit
Ferrea BMW N54 Single Spring Kit
Ferrea 09-13 VW 2.0T TSI / 15-16 VW Golf R 2.0T TSI Single Spring Kit
Ferrea Subaru WRX STI Endurance Dual Spring Kit
Ferrea Nissan GT-R VR38DETT Single Spring Kit
Ferrea Nissan GT-R VR38DETT Dual Spring Kit
Ferrea Acura K20 Drag Racing Dual Spring Kit
Ferrea Acura/Honda B18/B16 High Pressure Dual Spring Kit
BLOX Racing Valve Springs for D-series SOHC VTEC D16Z-Y (1.6L SOHC VTEC)
BLOX Racing Ti Retainers for B16A - B18C1-5 (1.6L - 1.8L DOHC VTEC) / H22A 2.2L DOHC VTEC
BLOX Racing Dual Valve Springs for K20A2-3 Z1-3 (2.0L DOHC i-VTEC) / K24A-3 (2.4L DOHC i-VTEC)
BLOX Racing Dual Valve Springs for DOHC VTEC
GSC P-D Nissan RB26DETT/RB26 Cylindrical Valve Spring Kit
GSC P-D Toyota 2JZ Dual Valve Spring and Ti Retainer Kit
GSC P-D Subaru FA20 WRX/BRZ/FRS Dual Cylindrical Valve Spring Kit
GSC P-D Ford Raptor/Platinum/Limited Ecoboost 3.5L H.O. Conical Valve Spring and Ti Retainer Kit
GSC P-D Mitsubishi 4G63T High Pressure Conical Valve Spring and Ti Retainer Kit
GSC P-D Mitsubishi 4G63T Extreme Pressure Conical Valve Spring and Ti Retainer Kit
GSC P-D 2017+ Audi RS3 DAZA Beehive Valve Spring and Ti Retainer Kit (60PSI Max Boost)
GSC P-D Porsche 991 Turbo Conical Spring Set
GSC P-D Toyota Supra/BMW Z4 B58 Beehive Valve Spring and Ti Retainer Kit
