What these guys are saying is correct.....all 110/130/150bhp MK4 Golfs are actually GTs - some of em VW just decided not to badge up thats all.
Theres a discussion on it here.....
http://www.uk-mkivs.net/forums/341904/ShowPost.aspx
http://www.uk-mkivs.net/forums/201871/ShowPost.aspx