Bavauto is legit. I purchased my remus exhaust from them since they had the best price. I've used them on and off for bimmer parts over the last 5 years.
2009 AW 535i
-Sport, Premium Package, and Comfort Access
-FBO, custom Cobb E30 map, 20" Forgestar F14 Black Gloss, KW V2 CO's