It will throw a shadow code to BMW when they hook your car up. Thats a no go for them. You can just look for the small vacuum cord that plugs into the muffler. Look under the drivers side rear wheel. Pull it some so there is a bunch of slack. Fold it in half, and zip tie it. Your hands will get a little dirty, but it takes 2 minutes. Plus if your car is still under BMW warranty all you have to do is cut the zip tie before you go in, and no one will know.
2012 BMW X5 xDrive35i E70 Sport Activity
(Wife's Daily Driver) 2000 BMW 328ci E46 - less than 90k miles
(Gone) 2007 BMW 335i E90