Both of mine are really noisy and have been from day 1. What is slightly frustrating is that my steering kit was fitted at the factory whilst they were waiting for the Brooklands exhausts to be signed off, but they didn't fit the other new components. Are you having the chassis mod done? I've been told that the cooling kit is not very well finished so I may not bother with that but I did have 1 cylinder down in Chiswick the other day for a short while.
At the moment I'm just having the steering kit fitted - the parts are due in tomorrow so will then book the fitting and service asap.
I doubt I'll bother with the cooling kit - it looks a bit ugly to me and I'll see how it gets on in the summer without.
The Centra compensator sounds like a good upgrade but I'd like to drive a 2014 spec car first before committing. Unless it can be done under warranty
I'm tempted by the Suplex upgrade but will see how the car goes at the Goodwood trackday first.