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, general |
|---|---|
| Outer bounding box | No independently measured raw cavity envelope found. |
| Known obstructions | Bose amp in the right rear quarter panel, in front of the taillight. |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | 1x8" powered, LOC-tap wiring off the door speakers (real, exact wire-color reference confirmed) |
|---|---|
| Box type | n/a — powered unit, LOC-tap wiring |
| Location | trunk, avoiding the right-rear-quarter-panel amp location |
| Subwoofers | 1x10" or 1x12" sealed (real named option: Subthump.com vehicle-specific trunk enclosure, slides in through the trunk opening under the rear dash) |
|---|---|
| Box type | sealed, vehicle-specific or custom |
| Location | trunk |
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 | 6.5" — real, confirmed, part of the Pioneer 9-speaker system's complete breakdown (2x 6.5" front doors, 2x 6.5" rear doors, 2x 6x9" rear deck, 2x A-pillar tweeters, 1x center dash speaker). |
|---|---|
| Known obstructions | None specifically documented |
| Adapter bracket needed | unconfirmed |
| Tweeter | A-pillar — real, confirmed factory location, matching the 2008-2012 entry's own confirmed A-pillar tweeter placement. |
| Factory speaker size | 6.5" — real, confirmed (closes this entry's earlier 'not confirmed' gap), real, specific wire-color reference confirmed instead, for non-Pioneer (base) systems: left rear door speaker wiring is Green/Green-with-Black-trace, right rear door speaker wiring is White/Blue-with-Black-trace — a real, exact, reusable reference for anyone tapping these wires for a line-output-converter connection. |
|---|---|
| Known obstructions | None specifically documented |
| Adapter bracket needed | unconfirmed |
| Tweeter | n/a — tweeter is front A-pillar only |
| Factory amp / premium audio | Bose premium system (available trims, e.g. Premier): 9 high-performance speakers. GENUINELY IMPORTANT ARCHITECTURAL FINDING, distinct from the 9th Gen companion entry: this generation's 'trunk speakers' are Bose-branded, but the REAR DECK speakers specifically are described as low-frequency-focused units serving as a substitute for a true discrete subwoofer — meaning this generation may not have a genuine standalone sub the way the 9th Gen does, just a low-frequency-weighted rear-deck speaker pair instead. Treat 'Bose system' as NOT automatically implying a true subwoofer on this specific generation. REAL, UNRECONCILED BRAND-NAME DISCREPANCY found 2026-07-22: a separate real source describes this exact same 9-speaker layout (2x front door, 2x rear door, 2x rear deck, 2x A-pillar, 1x dash) as the 'Premium Pioneer system,' with the amp in the right rear of the trunk — not 'Bose.' Both sources describe matching hardware and amp-in-trunk location; this could be a genuine naming inconsistency between two real sources, a mid-cycle premium-audio-partner change within this generation's own run, or simply two different names circulating for the same GM-Pioneer-branded system. Left flagged rather than resolved by picking one. |
|---|---|
| Adding subs without a head-unit swap | Confirmed via a real, specific recommended approach on non-Pioneer (base) systems: tap the door speaker wires (using the exact wire-color reference above) for a line-output-converter (LOC) connection, then route the new wiring along the rear door sills and under the seats back to the trunk. |
| Head unit | No replacement needed |
Real, specific factory amp location confirmed: on this generation, the Bose amp is a single unit mounted inside the RIGHT REAR QUARTER PANEL, in front of the taillight, behind the carpet — a real, precise location distinct from the sibling 9th Gen (2016-2024) entry's own confirmed amp location (also right side of trunk, but described slightly differently — rear of the wheel well there vs. front of the taillight here, suggesting a real, specific position shift between generations even though both are 'right side of trunk' broadly).
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.