[RKDinOKC]

250 and 27mm spring rates sound good. That is just a little stiffer than a stock 951, but not as stiff as the setup I had on my 951, 180-400progressive front and 31mm rear torsion bar. There is a little more power to deal with on a 951. Around 250 is considered a good autocross setup. The main advantage of stiffer springs is you can lower the car without bottoming out the springs in hard cornering.

Look for some Weltmeister fully adjustable front and rear swaybars, that will be the best for setup. Brian has the Lindsay 030 bar with 5 holes, it needs to be set between two holes for better mid-corner balance. The Weltmeisters have a sliding collar instead of holes. When I had my 951 I found a set of front and rear adjustable Weltmeister sway bars for $400.

The adjustable ride height Koni's are good, but you might want to also make sure they are the ones with adjustable rebound too. You adjust the front rebound for throttle application balance on corner exits, firmer keeps the front from rising and pushing, softer lets the front rise and keeps the rears hooked up. You adjust the rear rebound for braking on corner entry, too soft and the rear comes around too easily on turn in, too firm and the front pushes on turn in.

You also might want to consider a limited slip differential once you get the suspension sorted to calm down that one rear wheel tire spin in the wet.