Several companies have become car tuners (or modifiers) of Mercedes Benz, in order to increase performance and/or luxury to a given model.
AMG is Mercedes-Benz's in-house performance-tuning division, specialising in high-performance versions of most Mercedes-Benz cars. AMG engines are all hand-built, and each completed engine receives a tag with the signature of the engineer who built it. AMG has been wholly owned by Mercedes-Benz since 1999. The 2009 SLS AMG, a revival of the 300SL Gullwing, is the first car to be entirely developed by AMG.
