Nothing does more than tires. Geneo is dead on the money. Of course, after you put good rubber underneath, you'll be squirreling away everything you can to get suspension under the car because you find all the handling quirks magnified by 1000. And even if you don't mind some body roll, you'll be wanting better sways. Did I mention I can get the inside front wheel in the air on a turn now, and the engine races like the clutch is slipping because it needs a limited slip spool AND better sway bars?