I have had lowered cars drive a lot worse than the ST on eibachs, to be honest it drives better than expected, turn in is sharper and handles better on the twisty stuff, the ST sits to high for me standard so had to come down a touch, if the eibachs are good enough for ford then i have no problem fitting them to my ST, from what i was told at the dealers the standard shocks only have a years warranty anyway.
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Fiesta ST200, K&N Panel Filter otherwise standard for now.