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gsc5098
GSC P-D Mitsubishi 4G63T High Pressure Conical Valve Spring and Ti Retainer Kit
gsc5089
GSC P-D Nissan GTR VR38DETT Single Conical Valve Spring & Titanium Retainer Kit (Race Only)
gsc5085
GSC P-D Nissan RB26DETT Shimless Conical Valve Spring & Ti Retainer Kit ( Max Boost PSI 50)
gsc5044
GSC P-D Toyota 2JZ Beehive Valve Springs & Ti Retainer Kit (Check Fitment of Spring Base)
gsc5067
GSC P-D Toyota 3SGTE Conical Valve Spring and Ti Retainer Kit (Use w/ Shim Over/Shimless Bucket)
gsc5017
GSC P-D Toyota G16E Conical Valve Spring and Ti Retainer Kit