Might be helpful to know which "original run-flats" are on the OP's car now.
I have the Pirelli P7 Cinturato run-flats on my 320i and they are WAY better in every way (noise, ride, handling) than the Goodyear Eagle LS-2 run-flats on my wife's X3.
If I were to buy run-flats again, which I'm not, I would go with the Pirelli's.
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