The brown stuff is indeed grease, I will clean it
What you see on the gas tank is indeed the mod from Canniboomer. When I first started it I could realy hear the fuel pump, a few moments later it become less. Now you almost can't hear it when turning the ingnition on.
I installed the stock airbox for the moment, my K&N + outerwear will arrive in 2 weeks.
Will post some pics later.