Ok, so bit the bullet and signed up for a S4 on PCP. Gone a little mad on spec as I expect to eventually own it. Sports Diff was a must, most of my driving is Peak District B-roads so hoping for good things. Coming from a stage 2 8p S3, the power is similar on paper and delivered in a much more refined way. The Milltek for the S4 sounds unreal so this will be on the cards as my dealer turned a blind eye to non-exhaust related stuff. The long wait begins!