CV-TECH PRIMARY WITH SECONDARY OPTIONSIF YOU ARE WANTING TO GET POWER TO THE GROUND EFFICIENTLY AND EFFECTIVLY THEN THIS IS THE OPTION FOR YOU YOU CAN CHOSE EITHER A SECONDARY SPRING OR A STM SECONDARY. THESE CLUTCHES COME PRE CALIBRATED AND READY TO INSTALL INCLUDING NEW PRIMARY AND SECONDARY BOLTS IF YOU HAVE A SXS AND, OR TIRES BIGGER THAN 32" PLEASE LOOK AT OUR STM OR CAST PRIMARY OPTIONS PLEASE PUT ALL DETAILS AND MODS ABOUT YOUR QUAD IN THE NOTES SECTION WHEN ORDERING SO WE CAN MAKE