I like seeing improved intake and exhaust systems as the manufacturer is greatly limited due to emission standards. Next are rims, only the most tastefull of choices (no 22's here folks). If it is a sport exotic put exotic sport rims on it, something lighter then stock. Also, a *light* tint on tail lights can sometimes look good. Upgraded speakers and am amplifier to boost them (but leave the stock head unit). Everything else in my opinion detracts greatly from the appeal of the car. I HATE spoilers (or anything else which requires the drilling of holes in your $150k+ car), after market stereos NEVER look as good as stock (even though they sound better).