There is another option, but I've been told about last minute and didn't want to make rush decision.
Electronic valves with a switch inside the cabin.
Around 150quid each plus fitting, I would say up to 500quid in total if you do that in a good garage.
You fit them just before the back boxes in about 45 degree angle facing downwards.
No one say you cant fit them before the centre box or even behind the little single boxes.
When you hit the button, the electronic stainless steel flap cuts of the rest of the exhaust system completely and diverts all the gases down onto the tarmac, it's called Stealth mode
Let me draw that for you, it will be a funny drawing tho.
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2006 D3 S8 5.2 V10
Ceramic Brakes, Bang&Olufsen, DTV, DAB, Rear Camera, BT, TPMS, Soft Close, Auto Boot, AMI , 4 Zone AC, Home Link, All Electric Blinds, Fingerprint, Ski Hatch, Black Extended Leather, Heated Sport Seats, Alacantra, Carbon Trim inc Aluminium Pack 2.
2015 A3 S line 1.4 TFSI - for the missus to keep her away from my car.
Standard S-line equipment, no extras.
2006 D3 A8 3.7 V8 - SOLD but not forgotten