I think Santthuff and Mencers skocks are high dollar custom made drag racing shocks for all out efforts, Strange, Calverts, AFCO, Penske, Comp. engr. and several others aftermarket racing shocks are not the exact same quality as those two but all of them work well on a lot of cars
BTW, when I removed the old single adjustable Penske front coil over shocks on my Cuda and switch to a set of Afco double adjustable coil overs it took me two runs to get the car to go quicker and faster in the 60 ft. and the 1/8 mile, first run was with the factory recommended settings on both extension and compression and the second run I tighten up the extension all the way 1.27 to a 1.23 60 ft