Thicker sway bars front and rear with alloy links on the rear, 24mm and 22mm is a decent combo. Also if your coilovers have bump and rebound adjustment I'd look at jacking the car up a little bit and softening your settings bit by bit until you find something that works a bit better. Lowered cars look awesome but usually don't handle any better for it.

After that, buy another set of rims dedicated to track work and fit some really good rubber on them. You can get street legal semi slicks that are fantastic for track work so you can change your wheels over in the comfort of your own garage/carport and drive to the track and back (hopefully!!). That'll definitely improve your times for a start.

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No more GC8, sad face.
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