FYI, I paid 13K for my RS off lease with 22K miles on it and the remainder of the factory warranty that I extended out an additional 4 years, not that I needed to as I've had zero issues with it. I see today, the RS turbo's are commanding a stupid high price. Saw one on Car Fax, same year as mine (2014) for 25 grand. Guess when Fords quit making them, they went way up in price.
Only issue with mine is, it's a GDI engine with a dry intake tract so I have to clean the intake tract regularly with GDI intake cleaner, like every oil change regular. Automakers figured out that adding a small pilot jet to inject fuel in the intake tract would eliminate the carbon buildup with a GDI engine and mine don't have that. Other than keeping the intake clean, everything else is normal maintenance.