-for older muscle cars (carb'ed) the plug-n-play feature is likely to become a standard feature in other systems. Tunability is still there w/o a laptop as the more simplistic sensor system (compared to a late model vehicle) minimizes the complexity of the program.
-fuel system mods are still required to add a return line and perhaps increase the primary sides i.d. Not that big of a deal and if buying a new tank anyway the welding could even be done 'off the car', so to speak.