Originally Posted by Dblock2151

Go with the Technik Supercharger. Gives you a little over 4.8is power for around $6000. Many people here will recommend ESS, but they both use the same Kompressors (ASA), and Samir (owner of Technik) is very well known in the BMW Community, and is in California, instead of Norway, where ESS is located.

Website: www.technikpower.com

It isn't on there site yet, but they do have the application.