There are several remap companies, I got mine done by R-Tech and am very chuffed although not many other MK5s have used them (only me and cookiemonster that I can think of off the top of my head). Most people use Revo or Bluefin (custom code).
R-Tech are very competitively priced (I got mine in a group buy with some the MK4 boys and got it at a steal) and are top fellas.