Since you are concerned about being obnoxious, you sound like a perfect candidate for a full Dinan Catback. It's more of a smooth engineered sound, but remarkable at the same time. Remus may be obnoxious for you.
An X-mid-pipe only with the stock muffler will do absolutely nothing noticeable to the sound. If you go X-pipe you gotta go axle-back.
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2018 M550ix|Carbon Black|Dinan Modifications|2003 540i|Jet Black|M-Sport|2021 X5 Mineral White
Prior BMW's: 1987 325e|1993 740i|1998 740il|2001 530i|2002 745li|2007 750li|2006 750li|2001 530i|2012 535xi|
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