I found Shocks, under body bracing and RSB add the best results. I found tyre width did very little in the handling department, better traction off the line with 235 tyre. tyre choice is better tyres are just better! don't cheap out here!. Don't ever forget about camber/caster and toe (when lowering make sure you get adjustable camber/toe arms). What I do is every 6month on service when TH have my car I get them to make small changes to camber and realignment, so I can dial it in to my liking
Many want Power not many hold it long.........