My 20" BBS Detroit were £8k new and I have fallen 452s on them by no means banking, but not the stock Pirellis either. Having driven on both the assyimetricos from Pirelli and the 452s the car is far more stable and planted that it ever was on £1200 worth of Pirelli Tyres. Cheer Tyres doesn't automatically mean death in flames upside down in a hedge. If he needs 20" Tyres tell him to look at the kuhmo's ku39s, falken 453, vredestein vorti's, hankook V12's, plenty of decent reviews on those from cars with proper engines and non have died by fire.