Ive kept my eye on the forum for the last few months as ive been searching for a c7 and the content on here has been really helpful at times, so thank you.
Ive just joined this minute im based in near Manchester. After searching for the last year I finally bit the bullet and found a 6 in Rivera Blue which is really really rare. 2016 with 57k.
If any one bothers to take a minute to read this and help advise me...... it would be much appreciated.
Always been into evos and the JAP crap as people call it

My first job is the wheels and suspension
my first issue is there is a knocking noise from the front left corner. After having it checked all the bushes and ties are sound but the strut needs re gasing and only Audi can do this supposedly ? is this true and a common problem on a car this age?
Because of the age im thinking of replacing to coil overs to get the problem solved once and for all. I have been recommended bilstiens b16. Are they any good and worth the money ?
im wanting to drop the car 25-30mm I don't wish to slam it.
Also wheel spacers - I have been told you should run same size spacers ideally front and rear but reading posts people go 20mm back and 10-12mm on the front. Having different sizes, does this affect the diffs or anything?
cheers