If I recall correctly, Borla does not make an exhaust system for the M's or the Q70. They make a G35,37, etc which might be compatible and they do make an X design as well as the regular design.
My least fav is the Magnaflow - sounds like a cheap tart mustang or the like. Too gaudy and makes too much noise. Our cars should have a well bred, sophisticated growl like an S-class AMG or a Bentley.
I love my Tanabe Medalions. Love driving through a tunnel and mashing the pedal! Ahhhh the sweet, sweet note that says "get a load of ME".
Here is the Q50 AWD model:
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https://www.youtube.com/embed/YKOMonAZDRs"
Not sure what options are available for the V8's with AWD. Lots of members used to go with Megan's but they are VERY hard to find.