Ring / Spa set up

[s.mac]

With the trip coming ever closer I have 1 main question and 1 quick questions.

Quick one - Does Spa have a noise level limit ?
I'm thinking of putting my de cats on which I didn't think were noisy but I'm told they do increase the db, long way to go to get KB'd

Main one - I have adjustable suspension set at OEM ride height and set to -1.5 camber
Would it be worth lowering ? I also have adjustable top mounts which can be set to -3.0 but I have been told that's bollocks unless you set the car up each and every time with 4 wheel laser alignment.
Would I feel any benefit from either of the above bearing in mind I wont be no speed king, quick yes but I want to get home unlike the car in Mark's post.