Love mine lowered looks a lot better, handling is improved, never had any problems with catching or rubbing, I do slow down for speed bumps and you do feel it more over rougher roads, but had to be done.
I think the Ford approved kit lowers the ST about 20mm but there is a kit on rude racings website made by eibach that lower by 40mm.
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Fiesta ST200, K&N Panel Filter otherwise standard for now.