It’s half kit and half custom. MPR Racing in Michigan is who developed the DragPak Challengers and COPO Camaros for the NHRA F/S Classes back when they were first introduced. They designed and did the modifications to those cars. The last of those were the 2015 builds. The new 2021 DragPak is a whole new design and being built by Watson Engineering, as are the Cobra Jet Mustangs. So... the kit part of this is the Strange housing with all the brackets added and all the links, shocks, springs, etc. that are the MPR design specifically for the Challenger. The kit includes the third member with choice of gearing and the axles and brakes... all the same as the Dragpaks use. This comes directly from Strange as a part of the kit. That’s where the kit part of it stops. The install is a major deal because it involves removing the fuel tank and cutting into the floor to place a crossmember and roll cage connections with underlying floor support that is far beyond the basic 8.5 cert. All of this is necessary to support (triangulate) the attachment points of the 4-link. Don’t try this at home. I’m using a shop that is experienced in custom design and installation of roll cages and tube chassis. I know the first (normal) response is... holy shit how much does something like this cost?!!! The total cost of the “basic kit” is approximately $7500, depending on some minor option choices. The install is costing me $4000 with a additional $2000 for the custom aluminum fuel tank and sheet metal firewall that replaces my rear seat delete with one that will pass NHRA tech requirements for having a fuel cell in the trunk. There is also a significant modification to my existing 8.5 cage. The fuel system for this is obviously different than the drop-in setup I’m using now so that is an additional cost. The big system I’m going to is $3000 total. So for me..., the total ends up being $16,500. If you came rolling in with no cage (nothing) and did the complete install from scratch (including the full cage and wheels/tires) you would be looking at around $25k.