Very cool. How does the trim come off? Just prise it off from behind?Used a Dremel to grind off all the plastic welds until the old silver trim could be removed, then ground down all the remaining plastic tabs so the new diffuser could sit flush.
The notches on the new diffuser didn't quite match the rest of the trim so I needed to cut more notches in so it would sit flush, then I simply hot glued it in place.
See attached photos.
I did trim work like this on m Ford, unmelting plastic welds and installing new grab handles etc. Bit more stressed about doing anything in the GTI.