The SC2 R compound tires are track tires that are DOT approved for road use and the Super Sports are not R compound tires. It is only natural that an R compound tire will have more grip than a street tire. Good luck getting more than about 5k miles from the R compounds if you drive them hard.
Bought my 2016 tech GT350 in December 2019 with 7,500 mikes on it for $43, 800. It currently has about 24k on it and could be sold in Southern California for $55k (engine burns NO oil).
Probably a lot of ex-club racers like me that have 2016 techs. Club raced a M3 from 2002-2015. Done with open track and racing. Will kick your ass on the street, though. :)