Finally took the dive to replace the stock bridgestone turanza el42 run-flats with these ecsta 4x. What a difference they make! Road noise and ride comfort are much improved while no noticeble difference in the cornering and road tractions. The tire shop manager i went for the tire installation (who is a bridgestone dealer) kept saying i made a mistake to replace the pricy run-flats to cheapo kumhos. But boy i am so glad i did it. Those run-flats are JUNK,JUNK,JUNK. Call me cheap but for the price ecsta 4x is unbeatable!