^^ Glad i could help
Space grey has always been one of my favorite colors from BMW. Such a beautiful color.
Surprisingly SG is a rare color here in Msport trim. 95% of the Msports around me are white and the others are black.
As for the exhaust if you like it quiet and don't like drone i wouldn't get it. I think every exhaust for the N55 drones a bit. I know mine does at a very specific rpm range and I get around it by driving in sport mode all the time so that it keeps the revs above that point. A good alternative is to get the Bmw performance 550 style tips for your 535 so you have somewhat that quad look without any increase of noise.
Alan