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: 2-Door Coupe
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 |
|---|---|
| Outer bounding box | No independently measured trunk dimensions found. Vehicle-specific enclosure catalogues; published box footprints are lower bounds on the cavity, not the cavity: NET Audio '2003-2007 Infiniti G35 Sub Box Coupe Sealed' and '...Ported': 35.25 x 11 x 10.5 in (as printed; axes not labelled), 1.6 cu ft, trunk. Ground Shaker 'BLACK 12" DUAL SEALED SUB BOX, FITS INFINITY G35 COUPE 2003-2008': front height 13 1/4", rear height 9", top length 26 1/2", bottom length 37 1/2", top depth 5", bottom depth 19 3/4" (labelled by Ground Shaker), 1.90 ft3; Ground Shaker '10" DUAL' box: front height 12 3/4", rear height 9", top length 26 1/2", bottom length 37 1/2", top depth 12 3/4", bottom depth 17 1/2", 1.60 ft3. Zenclosures prints no outside dimensions (0.80 ft3 and 1.20 ft3 sealed designs, 7" to 8.5" mounting depth). |
| Known obstructions | NET Audio, of its 1.6 cu ft box: "12s will not fit on this box." Ground Shaker: "SUBWOOFERS WITH WIDE BASKETS OR MAGNETS MAY NOT FIT". No obstruction measurements published. |
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 | the 2003 Infiniti release gives a Bose speaker count (8) but no sizes or positions; Metra does not cover Infiniti |
|---|---|
| Adapter bracket needed | unconfirmed |
| Factory amp / premium audio | Infiniti, 2003 (pricing release copy): G35 Sport Coupe option "Bose premium 225-watt, 8-speaker audio system with RDS" (the sedan's was 200 watts, 7 speakers), with an in-dash 6-disc changer. Standard system, from a buyers-guide aggregator (secondary, 2005 and 2007 coupes): 160 watts, 6 speakers, no subwoofer listed. 2004 and 2006 not read. Whether the Bose option continued after 2003, and where its speakers and any amplifier sit, were not found. |
|---|---|
| Adding subs without a head-unit swap | no Infiniti-specific line-output or amplifier-integration information found |
Seven vehicle-specific boxes from Zenclosures, NET Audio and Ground Shaker fit the trunk; the Zenclosures and Ground Shaker 10"/12" designs slide in below the rear dash, NET's is a 35.25 x 11 x 10.5 in (axes unlabelled) box. No Infiniti trunk volume was read, and EPA's coupe luggage figure is 8 cu ft for 2004-2007 but 11 for 2003, so neither is given here as the trunk volume. Measure your own trunk before cutting wood.
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.