Congratulations, you bought yourself a Veyron. May I interest you in a service plan?
To change the fuel tank $42000 (includes labour)
There are 4 turbos, $6400 each, labour $9000 (for a pair?)
4 camshaft position sensor $9 each (shared with Golf), labour $7200 (all 4).
Exhaust manifolds $2000 per side, labour $22000.
4 oxygen sensors <$300 (same as Passat), labour $15000
oil change? $20000-25000 (unconfirmed).
https://www.roadandtrack.com/car-cul...-repair-costs/
I suppose if you can afford a $1.7 million car, these prices are chicken feed. Regarding the $42k fuel tank swap, I've never owned a car worth that much.