For a NA Sol, my best suggestions would be lowering springs, anti roll bars, and better tires. Kappasphere has the springs, the bars can be had from GMpartsdirect, and the tires (Bridgestone RE-01R) from The Tire Rack.
DD
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Future so bright I have to wear shades!!!
Mean GXP (VIN 117835 11/06 )
Name: Growler
Name: Growler (Vin #4878) Traded for Mean GXP 3/19/07
Mean, dark side, ebony leather w/red stiching, LSD, ABS, AC, Monsoon 6CD changer, mats , headliner, stability control, XM, power pkg., convenience pkg., chrome wheels, sport peddles, Fiam Air Horns, Magnaflow, De-badged, shortened waste gate rod mod.
Garage Mates: 2005 Yamaha FJR1300, 2003 Yukon w/K&N CAI, 2003 Honda CRV