Did someone mention alloy wheels?
I always half fancied a set of Mak Wolf on my GTI PP.
https://www.makwheels.it/en-sh/wolf.aspx#!/OEM looks and good quality plus quite cheap directly from Italy via eBay.
I nearly bought a set of Borbet FF1 for my R (and Clubsport) though.
Again, not too expensive via tyreleader.co.uk
As for the Belvedere lovers and haters.
Great style, nice and light too but the black scratches up too easily and they look too small on the Clubsport due to the wing and big bumpers. They look better on a regular GTI but still sit too far in unless unless spacers are fitted.
I couldn’t wait to get mine off my CS and fit something bigger in profile to balance out the rear wing.
Pretorias look great but are very fragile.