chunga1 -- on street tires, it won't completely hook up at full throttle until well over 100 in fourth (breaks 'em loose if you jump back in too hard when dumping into fourth) -- and I am running the big guys in back, Michelin Pilot Sport 345/30ZR19 ZPs ('zero-pressure', i.e. runflats) (on 12"-wide rims) (front 275/35ZR18 ZPs on 10"-wide rims)