Our 2004 TL road race car at THR Racing once (at VIR 13hr race in 2010) broke both front upper control arms (straight up broke the metal completely) when we ran 275/30/17 BF Goodrich R1 tires up front with 255s on the back
it was turning 2:09 laps at VIR, which is not slow at all for a car with that much weight over the front axle