Called shelby, the guy I talked to doesn't know anything about these shocks. I called Penske, the sales manager for shelby used to work at Penske and if you get him he does know. Penske did answer all my questions. These shocks are take apart // self serviceable, you can buy their pistons and shims and re-valve yourself or you can give Penske your target damper curve and they will make it. For instance Penske recommended using their VDP piston which is a dual digressive piston but has additional flow ports close to the center of the piston which allows you to pre-load the shim stack but also tune the high speed to give yourself more force if you decided a very flat blow off (Knee) is to little high speed to start with. That said the ONLY thing I'd change with these is the amount of bleed since I'd want a 3 inch per second knee (giving me a softer ride).I did put a link in my post. If you look at the closeup of the strut, what appears to be a Cortex logo on the mounting ears is pretty clear. As a good number of the Shelby parts seem to be products from other manufacturers (Moroso oil pans, Maximum Motorports S197 camber plates, etc.) with CS logos on them, I wouldn't be surprised if they contracted with Cortex to build the strut housings.
From the Shelby page:
4-post vs 7-post means they couldn't simulate aero load & dynamic roll/pitch/squat, but they were probably targeting street/HPDE non-wing cars so it doesn't much matter. But it gives you a much better starting point for revalving for stiffer springs needed for big aero than starting from scratch and some educated guesses.
My approach to this would give Penske a call to see if they have access to the shaker data, and that thse use "standard" Penske parts. They (or your local Penske shock tuner) could use that to come up with valving for the spring rates needed for the aero you're running - but you need to know the actual downforce you're making (from suspension travel data logs). Buy the Shelby kit, replace the springs with stiffer for the aero load, and have the dampers revalved to match (if the stiffer springs are outside the range of stock adjustment). Figure a few hundred bucks in springs and the same for revalving - still way cheaper than TTX or inverted Penske. And it gives you the chance to try the Penske digressive valving.
The kit comes with brackets to adapt the rear shocks to fit the OEM control arm however Shelby nor Penske sell anything to defeat the magnaride system. You'd have to source an aftermarket item to deal with that. This kit looks like a great place to start