If you're mainly concerned with the drop, the Eibach is probably the best bet. If you want to maintain street and track performance but don't want to go to coilovers, then look to the Dinan kit which has an ideal spring rate for the EDC and provides hats and bump stops to match the spring changes.
I've not riden in an HR car, but what I read in many threads here is that they're harsher.
I've got the Dinan kit.
Dave
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