You could go on forever supposing what it could be. This is a topic that's been done to death, yet will continue to live as long as we have these problematic automatics in our X's.

Do a search, you will find dozens of threads on this.

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Present:
01 X5 4.4i
07 Yam R1

Past:
89 R32 Skyline various mods, running 442 BHP
00 Merc CLK55 AMG
01 E39 M5 Haywood and Scott silencers
02 E46 M3 Supersprint Cats, Eibach Lowered, Thorney Motorsport Remap, running 368 BHP