On my BDR you'd remove the left rear tire then place a jack under the brake rotor and jack it up a bit to compress the spring a little. Then using a coil-over adjusting tool (
http://store.summitracing.com/partde...5&autoview=sku) or similar, you can tigthen the slotted nut at the top of the spring a few turns, reinstall the wheel and lower the car, see how it looks, and keep doing this until it looks right. Then I'd take it to a suspension place, get the car scaled and ride height properly adjusted, and aligned.
Good luck!