Ah, sorry, I didnt check the video in the link actually, was going off Green Dragon's post only for that. Also just to show the OP how the tilted can muflers mount up.

Another option I was wondering about would be a UUC TSE 330i muffler (a 2 can side by side muffler) split to two. At least that would be a system designed for an M54 engine.

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04 X5 3.0i auto
03 X5 4.6is