Did a search here and elsewhere and found that the Duralast 49-DL is the "drop in" replacement for the E46 unless you have a convertable in which case the battery compartment is smaller.

Is this still the case for my 2004 M3 (non-convertable)? In other words any downside to this battery that has been discovered? I've got a dead battery and need to get one. The dealer OEM is $202 and this is only $101.

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E36 Stats: 1995 325is: 125Kmi; TSW Rims; Bilstein shocks; K&N panel filter; Pioneer/ Polk audio CD/MP3; Conforti Chip; NGK Iridium plugs. Original owner.
E36 Replacements: drivers seat leather (1), wheel bearings (3), water pump (1), radiator (1), rear brake light assembly (1), battery (3).
E46 Stats: 2004 M3, 45Kmi (3rd Owner)