Looking good, and oh so shiny
The Cupra lip needs looks like it needs a little sorting out in the middle and is an easy fix once the bumper is off.
Whilst my bumper was off I used stainless steel allen bolts, stainless washers and stainless nylock nuts to hold my lip on.
To get mine straight and level in the middle I cut the 2 lip struts to the correct length/angle.
I then inserted a long piece of black rigid fibreglass kick board (plastic would also be ok) inside the bumper above where the 2 struts are located.
The fibre/plastic being approx 4mm thick and running the whole length of the bottom of the grill.
The plastic acts as a strengthener for the floppy bumper bottom.
I then used longer stainless allen bolts and large stainless washers through each lip strut to hold them tightly to the underside of the now more rigid bumper. The large washer on the lip strut bolt stops it pulling through the strut
See here...
http://www.audi-sport.net/xf/threads/post-pics-of-your-b7-a4-s4.21579/page-35#post-2505081
and here...
https://farm1.staticflickr.com/488/19447343945_85832f87d5_b.jpg
Hope that helps.