Sub frame connectors
... Other than that it's just welding...
I believe that you don't see this as a big deal...but (correct me if I'm wrong here) the trimming and adjusting to get these to fit perfectly along the floor pan then prepping/welding the entirety of the length is orders of magnitude more troublesome than bolt-in/weld-in options.
It certainly doesn't sound like rocket surgery but doing it right is time consuming and daunting to people who don't have welding experience, proper working space, extra time, etc.
Are these better? Most people seem to think so! They certainly look way better. Is the level of improvement over more accessible options proportional to the additional effort/expense? That's not a forgone conclusion, IMO.
If anyone wants to offer up their Mopar for me to practice on, come on over! :D
