I've just recently scrapped my 97 8v GTI, but took a full jetex decat back exhaust system off it. I know all of it will fit, its just the decat pipe im not too sure about.
The decat pipe ive got looks exactly like this

But looking at decat pipes for a VR6 they seem to be like this
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So looks pretty obvious they wont fit, but just double checking as the exhaust system i have was for 8v/16v & VR6, but i bought the decat seperate from the same company, so wasn't sure if it was the same fitment as the rest of the exhaust.