I have Z4 with adjustable Koni's. They're great for that 3,000 pound car.
The Speedster has KYB Excel-G (gas) all the way around. The ride is firm, ...um hard. We have a crew installing bumps and pot holes here...don't know what they're paid. I've been looking for a softer shock for the front that would still provide good handling and really haven't found much. Oil shocks seem to, almost be, a thing of the past. There has been some discussion about EMPI shocks but I just can't pull the trigger on those.
I would think the Koni's would be too stiff even at the low setting. That's where I have the Z4 shocks set.
What to buy?