What we researched for this specific generation: where an enclosure actually fits, what the factory speakers are, how the factory audio is wired, and which real builds and commercial products exist for it. Confidence badges say how well each figure is sourced — this is research, not manufacturer spec.
Body styles covered: 4-Door Sedan
These are researched envelopes, not a guarantee. Measure your own vehicle — the numbers here tell you what to expect, not what you have.
| Location | trunk, behind the rear seat |
|---|---|
| Outer bounding box | Vehicle-specific enclosure catalogues; published box footprints are lower bounds on the cavity, not the cavity: SRQ Customs 'BMW 2003-2010 E60 5-SERIES SUB ENCLOSURE (DUAL)': 36 x 18 x 12 in (as printed; axes not labelled), 1.75 cu.ft. for 12 in woofers and 1.5 cu.ft. for 10 in; a notch along the top "allows it to tuck all the way to the back of the rear seat"; "allows for access to spare tire"; SRQ Customs 'BMW 2003-2010 E60 5-SERIES SUB ENCLOSURE (SINGLE)': 36 x 18 x 12 in (as printed; axes not labelled), 1.25 cu.ft. for a 12 in woofer and 0.75 cu.ft. for a single 10 in; the top notch lets it "tuck all the way to the back of the rear seat"; allows access to the spare tire. Zenclosures prints no outside dimensions. |
| Known obstructions | SRQ Customs notches the top of its boxes so they tuck to the back of the rear seat, and says the spare tire stays reachable. No measured trunk dimensions found. |
Sizes and depths below are what research turned up for this generation. Confirm against your own vehicle before cutting or ordering — trim levels vary.
| Factory speaker size | no maker or Metra source read for the front doors |
|---|---|
| Adapter bracket needed | unconfirmed |
| Factory speaker size | no maker or Metra source read for the rear doors |
|---|---|
| Adapter bracket needed | unconfirmed |
| Factory amp / premium audio | BMW's 2004 and 2005 US technical data contain no audio information; no audio detail was found on a maker page. |
|---|
BMW North America's 2004 and 2005 technical data print "EPA cargo volume, cu ft." 14.0 for the 525i, 530i and 545i sedans; fueleconomy.gov prints 14 for the sedans in 2004, 2007 and 2010. A luggage rating, not a box volume. Boxes: Zenclosures 1.10 ft3 per chamber at 8.00 in; SRQ Customs 36 x 18 x 12 in at 7.5 in, spare tire still reachable.
Outside links. Some are commercial products, some are owner builds posted on forums — the label says which. We do not endorse any of them.
Each link opens the tool with this vehicle already selected.
Measure your own vehicle. Trim levels, factory subwoofer options, and mid-generation changes all move these numbers, and a box cut to a researched figure that does not match your truck is wasted wood. Where a badge reads Unconfirmed, treat the value as a starting point for your own measurement, not as an answer.