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Suspension Are there any progressive springs that maintain stock height?
SuspensionSprings, struts, coilovers, sway-bars, camber plates, and all other modifications to suspension components for Cooper (R50), Cabrio (R52), and Cooper S (R53) MINIs.
I think that the JCW and HSport are the least drop progressive springs for Mini Cooper S.
Nope. H&R makes an 'OE Sport spring' that is only supposed to yield a "moderate" drop of 0.6 inches on average. Make sure you look for mfr# 50416-2 though, as there are other more aggressive variants. Search H&R and Central Coast Coopers on NAM for reviews.
Note: some (esp heavier cabrio owners) have experienced greater drops, so there doesn't seem to be alot of consistency.
What are you trying to accomplish with progressive-rate springs?
If the answer is a softer ride, but with tighter handling, then Koni FSD shocks will do that, and with less effect on initial turn-in (progressive rate springs tend to initial turn-in make feel sloppier).
You could also get a softer ride with a taller-sidewall tire, i.e. by using 15" wheels.
I can't think of any other reason to use progressive springs, except for a softer ride, but perhaps you have another purpose?