I own a 2010 BMW 535I X-drive N54, I'm looking to get exhaust work done to it but I have no idea where to start, what to get or where to go. I do have catless downpipes from vrsf to install but im deciding on whether to have the install done by the exhaust shop or Install them before going to the exhaust shop. I'm curious on what people are running on their 535i or other similar chassis.