On Supercharger we don't have a great answer today, MP62 kit is still my choice on my 2007 and it's still great but I really don't know if another batch of those will happen. Meanwhile the Kraftwerks kits just were not fully engineered in our experience, not completed. Perhaps they have fixed them, don't know. Thus, cannot say that I am really happy with any boost options today for 2.0, would rather do 2.5 conversion. We are talking about another NC project here, likely do 2.5 and about 200 hp and leave it normally aspirated. Our Project Blue was a real joy around the track with just normally aspirated 2.5, Ohlins, 6UL wheels, etc.
Which brings us to big improvement in handling without screwing up daily ride. That we can help with today, Ohlins Coilovers are the easy answer. And I usually suggest folks hold off on sway bar upgrade until after they put some miles on the Ohlins, you might still want it even more flat for track days but the ride/handling balance of the Ohlins out of the box without more mods is so good that many conclude nothing more needed on handling.