This is an improvement from the 46 HRC. We have added a 2-way compression adjuster, which allows you to adjust the low- and high-speed compression damping independently of each circuit. The 2-way compression adjuster is placed on the reservoir end and has a 13 mm hexagon for high-speed adjustment and a screw driver slot for low speed adjustment. Maximum compression damping is when the adjusters are fully closed, i.e., when the adjusters are turned fully clockwise. All this together will give you the suspension you need, to meet your high demands on the track. Have a question regarding this item? Please use our Contact Us form or call (707) 938-5664 for Customer Service.