SQ7 - ABT Remap/Sound Control/Level Control

I've had a quote of £5,766 incl VAT from Richter Sport to supply and fit the above three modules to my SQ7. The draw of an extra 85bhp (£2,998.74), 2cm lower suspension (£1,463.58) and louder (£343.13) is tempting especially with it avoiding warranty breaches.

Question, has anyone else had any of these three fitted? What are your thoughts? Lastly, how does the quote compare? The remap and suspension seems far too big to me for plug and play boxes.

ABT is very well regarded in Germany and at least here, works alongside Audi. May not be the same in the UK, but in Germany ABT will (happily) sell you a (very expensive) warranty to cover whatever Audi themselves won't cover.