Thicker propeller blades, less gun smoke, oil splash on the windscreen, and I would ask for an improved sound but diveplane has fixed that for us!
@DavidRed: are you watching the temprature gauges? If you don't let them overheat, the engine will be fine. I don't have a problem with the engine blowing up like I used to because I just let it cool down every so often in a fight by bringing the power back a little.
And the cruise engine setting for escorts was about 22 inches of manifold and around ~1800RPM? Not entirely sure but it was somewhere around that.