In the world of performance tuning, it seems like every automaker has a performance branch or ‘garage.’ For instance, BMW has its M branch and Mercedes has AMG. In terms of Audi, there is Quattro GmbH. This subsidiary of Audi takes the conventional A-series cars and adds a host of technological and performance enhancements. From the A4 series, Quattro GmbH developed the RS4 – the top tier of the A4’s development. Where the A4’s largest engine option was a 252 hp 3.2L V6, the RS4 came powered with a 414 hp 4.2L V8. This helped shave around two seconds off the 0-60 time posted by the A4.