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I'm running Spoon progressive springs on oem Showas right now too and the ride is fantastic.It's smooth,doesn't bounce,you can definatlly tell it's a bit stiffer then stock but you don't feel any harsh impacts on bumps or dips.The only downside is the drop is not to aggressive because it's designed strictly for function.
I also had Mugen Sports Suspension on my 2001 Prelude which is a fixed Showa damper setup as well.After 2 of my friends drove my car they sold there Tein and Tanabe fully adjustable setups in favor of the fixed dampers.