Theres also AMD tuning http://uk.amdtechnik.com/content.jsp?pname=Homepage
they do all the remapping, exhausts etc for skoda's, audi's, vw's and loads of other cars

my mates dad has a skoda octavia 1.8t4x4 ex-cop car, was 180hp before it was taken to AMD, where it now has exhaust, induction kit and a re-map and a couple of other bits. Was dyno'd at 220bhp, pulls like an absolute bastard on boost!