" MRC Tuning does not get as much attention as it deserves at least in the USA likely because it is based overseas in the UK. They are one of world's premier Audi tuners though doing all kinds of interesting projects such as a single turbo Audi R8 4.2 which to this point nobody else has done
. They also have won the Audi Driver Audi Tuner Gold Award in 2006, 2007, 2008, 2009, and 2010. So, yes, they are kind of a big deal.
The B5 S4 you see below is not some insane build but a K04 turbo upgraded setup. It just goes to show that MRC Tuning does everything from mild to wild and that a mildly upgraded S4 can put down some very nice power. How about 422 to the wheels with RS4 cams, RS4 manifold, RS4 throttle body, RS4 Y-Pipe, MRC downpipes, Milltek catback, AWE intercoolers, aquamist meth injection, and of course MRC Tuning for the K04 turbos?
The B5 S4 remains a great tuning value especially as the cars have fallen below $10k and basic bolt ons can push it over 400 horsepower to all four wheels. Keep in mind K04 turbos are a pretty good value and readily available in the Audi tuning scene. If one wants to get crazier, they can.
Pictures, video, and dyno graph below.