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I had similar problem Car is Audi a3 Quatro 184bhp tDi Found was loosing coolant intermittently Changed coolant cap Changed coolant resevoir Specialist suspected overheating but my temp guage always stayed in the middle His suggestion water pump so got that changed Still same problem then he pressure tested it. Came back OK Mechanic kept talking about overheating. I wasnt convinced I suspected overpressure. After a journey. Coolant level would be fine the next morning it would have gone. So i decided to leave the bonnet open let it cool down properly. Still coolant loss Mechanic now talking EGR etc expensive.... Then i tried something that was suggested on the group blocked heater matrix. Mechanic ggoedo you have a leak in the footwell. I didnt So I drove around for a couple of weeks NOT turning my heater on. Bingo no coolant loss Got heater matrix changed and seems good now So blocked heater matrix or partial blockage was causing a build up of pressure that eventually had to release through the cap via the hole in the tank Got genuine heater matrix from TPS. It a valeo. Autodoc sell it much much cheaper. Mechanic said dobt but it from Euro car parts as it doesnt fit

Think all aidis have dmf now. Even my old a6 does. Here's someone with a similar issue but there's is an auto. There problems also started after a remap. I notice their torque is less than yours but that'll partly be due to there's being an auto. https://www.google.com/amp/s/www.audi-sport.net/xf/threads/audi-a6-40-tdi-c8-gearbox-vibration.431231/%3famp=1 I'd definitely recommend speaking to the tuning company. If it is the dmf you might need to upgrade it with an aftermarket one that's stronger, do a solid single flywheel conversion and uprated clutch. Here's an upgraded one for an example, but notice when the upgraded one can't handle over 475nm of torque whereas you're running over 500nm on the stick set up. https://clutchstop.co.uk/products/luk-dual-mass-flywheel-sachs-performance-clutch-kit-for-volkswagen-audi-seat-skoda-02q-6-speed-gearbox.html I've heard people talk about this company for upgraded clutches etc. But I don't see the A6 c8, but might be worth emailing them: https://clutch-specialists.co.uk/

Glad you're pleased with it, it's great to get positive feedback on modern Audi's. Especially as most people will only come onto a forum etc when they have a problem.

Well done for saving this S3. I'd recommend you looking at eBay for the catches. Any A3 8l ones should fit.

Lovely looking car. Did you have any look at getting an A4 b5 in the end?