18s with 225/40 Goodyear RS-02
I did this and it makes a subtl yet very substantial improvement in the 'strength' of the car, especially with wider offest as I have, and it appears you also are using a wider offset.
Cheapest of all is finding another 4.2 or S6 car in your color in a recycling yard - then you don't even have to paint and the install takes all of 10 minutes and 8 screws!
For me, there were no volano black cars to get the parts from, so painting was required...



