I track my car and am running H&R springs. Went this route as an interim approach until the stock shocks need replacing, then it's coil over time (or unless the Ohlins GB happens first (yah right!)).
The improvement over stock is very noticeable. I found the stock springs crashy, bouncy, and generally crap. These improved on that, as coilovers will further improve things again. They don't ride any harder than stock - if anything the car feels more planted over the bumps.
If you buy them make sure you get the 15mm pads for the rear.
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