The PB piece stated the high speed rebound sits on the main piston, with the slow one on the shock's body. They are apparently changing the spring rate on the shims preload, as they do on the GRIP2 cart. The slow speed one should be a needle or a poppet valve IMHO.Rebound now on main piston: Just fox realizing what a dipshit system they had previously with it being on poppet valves. Fucking 2020 and they were still making crap that no one would stand for in motorsports. They probably did realize it...they just didn't care.