golf 4, leon, A3/S3, TT, octavia, bora/jetta its all the same car. if its fits one it fits them al,, almost.
if you take a complet exhoust of a LCR: manifold, turbo, downpipe, pipes and cat back complet and try to mount it on a FWD golf 4 1,8t, the only think you might not get on is the back box as the rear end/bumber is not the same.
one think to remember is FWD is not the same as 4WD.