Customize your Pro - C or Pro - S II Coilovers for the perfect balance between daily driving and track performance. Skunk2 Race Springs for Pro - C or Pro - S II Coilovers allow you to fine tune handling performance and driver feel through customized spring rates and ride heights. All Skunk2 Race Springs are CNC - wound using the highest quality SAE 9254V spring steel, shot - peen stress relieved, and corrosion - protected thanks to powdercoating and specialized phosphate treating processes.