It's important to note that the 4.8is mufflers are MUCH louder than the 4.6 mufflers (which are the same as the 3.0i mufflers, except for the tips). If you want some extra noise for low effort, that's probably your best bet. I believe that the 4.4 N62 mufflers are the same, but don't know that for certain.

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2011 M3
2006 Sierra 2500HD 4WD LBZ/Allison
2004 X5 3.0i 6MT
1995 M3 S50B32
1990 325is
1989 M3 S54B32

Hers:
1989 325iX
1996 911 Turbo