First thing is you would have to consider the cost of an all stainless exhaust system.
Also something to think about ….
How long of a drive averagely does the vehicle go.
Short trips ( locally ) are harder on batteries, oil, condensation buildup etc.
FYI, 20 – 30 minutes will allows the exhaust to fully reach temperature and ” dry out most of the moisture.
That will also allow the oil in the engine enough time and heat to allow it to ” dry out “