Quote:
Originally Posted by Turbod
Not reading everything everyone else has posted so far. xDrive has secondary cats so the car is a little bit louder than when the valve is open but not bad at all. The smell difference is very minimal due to the secondary cats. For people reading this without xDrive, the cold starts are decently loud and the car under WOT from the back is loud but inside the car is just loud enough to be enjoyable. Obviously if you have no cats there will be a smell but you'll only notice when stationary for a period of time, more so when the windows are down.
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Definitely agree here, I have 2011 E90 N55 X-Drive with CTS downpipe and muffler delete. The smell is not too bad daily driving with the windows down most of the time. The only time you'll really notice it I'd say is if backing into the garage since all the fumes are going inside. Other than that smell is not really an issue.