I fitted the OEM Volvo strut brace which I bought from the dealer for $185. It went on very simply, all you need is a torque wrench and a set of metric sockets and about a half hour of your time. I find that the effect around town is almost negligible but on interstate sweeping off ramps the car feels as if it is rails. Unfortunately we don't have too many twisty roads in South Florida but I would imagine it comes into its own under those circumstances.
John Scales (1996 850R)