Wheels
There are plenty of wheels available in the market. You can make your pick and not worry that your friend have the same wheels. Of course there are some popular wheels like Alpina, Borbet, Hartge etc. which are commonly used. Balance between the car and the wheels is the most important thing when choosing wheels. For example huge 20 inch wheels doesn’t necessarily look good with your 300-series bimmer, but in 700-series they would look awesome.
BMW offers wide range of wheels it own. Especially M-series wheels are popular when you want to spice up your regular bimmer. Original wheels aren’t the cheapest but you get quality wheels that doesn’t let you down. There are also huge amount of replica wheels that imitates original bmw wheels. Replica wheels aren’t even close to that quality what original wheels provides but you get at least the same look that original ones have.