It wouldn't be the first time a Golf GTi has suffered lack of power problems......
http://www.tyresmoke.net/ubbthreads/showflat.php?Cat=&Board=GTi&Number=317716&Searchpage=2&Main=317716&Words=RS4_Barry&topic=&Search=true#Post317716
http://www.tyresmoke.net/ubbthreads/showflat.php?Cat=&Board=GTi&Number=317716&Searchpage=2&Main=317716&Words=RS4_Barry&topic=&Search=true#Post317716