Hi, I am running twin V6 in my Maxum 2800SCR with Bravo Two drive. WOT is 37 Mph with alu prop 19". Will here be any gain or difference if i change to Stainless prop on a bravo Two?

any good ideas?

Yes SS propeller hold thei geometry longer and therefore maintain performance for longer periods of time. Likewise the cripness of the leading edges and cups hold water better.

Better performance across the board. More in some areas and less in others.

I have a few customers with larger boats and bravo 2's, they changed over to stainless 4 blade props and they said that it ran out much better than the 3 blade alum or stainless.
Bravo 3 drive's would also make a big diff. on performance.