Well... not sure I have the definitive answer for you.
I started with Boge Turbo Plus, but had a failure and Nick at fcpgroton replaced them under warranty with Sachs Advantage (at the time, the same shock but made in Germany and not Turkey, IIRC). Those were fair with the overload springs, but with no load in the back the rebound stoke was pretty sharp when going over something like a speed bump. Potholed New England back roads made for a lot of noise in the back, and discomfort.
About 60K miles later my rears were mushy, and I called IPD to get their recommendation for rear shocks with the overlaod springs. They recommended the KYB Gas-A-Just in a heartbeat. Got a pair and put 'em in - and ye gods, it was WORSE! Normal transients on a smooth road, no problem. But I had since move to AZ, and this state is in love with freakin' speed bumps, so 2-3 months of that was all I could take.
So I pulled the KYBs out and put in a set of the Bilstein Touring - all 4 corners. I have not experienced the noise with the rear that apparently everyone else on the Brickboard has. The speed bump problem is reduced but hasn't gone away; I now accept that as a compromise I get for having the stiffer springs in the rear. Overall, I'm quite pleased with the Bilsteins.
One thing that IPD was not able to tell me specifically was the spring rate of their OL coils. The stock springs were just too soft for any sort of load (like 190 pounds of labrador retrievers), but the OL springs seem to be too stiff if you don't carry a load all the time. The seat of my pants says it's probably 30% stiffer then stock, but 15% stiffer would have been more along the lines of what I need.
I think the wagon springs in a sedan is an ideal combination... just a modest increase in stiffness. I'll make you a smokin' deal on a pair of KYB's if you want!
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No one ever went broke underestimating the taste of the American public - H.L. Mencken
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