For supercharged K20, you will need to run the fuel at 3.5bar as opposed to 3.0bar for NA setup.
As I already had the Webber FPR, I chose to change the internals for the one I had, rather than buy a replacement.
This, in fact was pretty straight forward.
1. I first removed the regulator from the car.
2. I then removed the retaining circlip on top of the regulator.
3. Once free, I simply pushed the internals (valves) out through the top.
4. Installation was pretty much the reverse.
This whole job took about 10 minutes end to end. Pretty simple.
Once back on the car, I could workout the layout of the rest of the installation.