The 99-00 Civic Si suspension is a little stiffer (from memory) but no ride height drop. wouldn't be worth it. If you did coilovers/shocks that is probably the harshest you can go. If you want better handling but little better ride I would go with Tokico Illuminas and some Neuspeed or Eibach 1.5" drop. Not too drastic and not too stiff.
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