2018 Corvette Grand Sport Stock motor and suspension.
18x11 on 295 Yokohama AO52's
18x13 on 315 Yokohama AO52's
Brake pads are ST43's
Yoks are magic on there first run but I have a hard time getting into my rhythm on my first run. I usually clean up my second lap but even with better execution my 2nd lap is usually .5-1 second slower. 
A lot of mistakes some worse than others. Turn 7 and 8 definitely cost me some time. 
I ran a 2:13.148 later in the day but I forgot to turn on the PDR. I believe it is the SCCA Sport 1 lap record eclipsing Andy Hollis's 2018 time of 2:14.4 in his Mclaren MP4-12C
I'm ok with banning Yoks for TT. Too much money for a one lap wonder on a heavy car.