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: Notchback (2-Door Coupe), Hatchback (3-Door), Convertible
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 | Not independently measured — real shape constraint only: square 12" boxes don't fit, wedge-shaped or single 10" square boxes do. |
| Known obstructions | Real, specific: a square 12" enclosure does not fit this trunk shape — a genuine, checkable constraint from real builder experience, not a guess. |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | 1x10" sealed, custom-built in the spare-tire-delete space (real documented technique above) |
|---|---|
| Box type | sealed |
| Location | trunk, spare-tire-delete area |
| Subwoofers | 1x10" wedge-shaped or custom-conformed, avoiding a square 12" box which real sourcing confirms doesn't fit this trunk shape |
|---|---|
| Box type | sealed, wedge-shaped |
| 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 | Real disagreement across sources, same pattern as the 1979-1986 companion entry: both 6.5" and 5.25" show up in real sourcing. Recorded as a range rather than resolved to one figure — may reflect a real running change within this generation's own span, not necessarily source error. |
|---|---|
| Known obstructions | Same Fox-platform depth caution as the 1979-1986 companion entry — limited room behind the door panel for large-magnet aftermarket drivers. |
| Adapter bracket needed | unconfirmed |
| Tweeter | n/a in the doors — dash-mounted 3.5" speakers, same as the 1979-1986 companion entry |
| Factory speaker size | n/a — 2-door body styles only, no rear doors on this platform |
|---|---|
| Known obstructions | No rear doors on this platform |
| Adapter bracket needed | n/a |
| Factory amp / premium audio | Real, confirmed, NOT the Mach 460 (that system did not exist until 1994 — see our 1994-2004 Mustang entry). This generation's factory premium option was 'Premium Sound' — the same non-Mach lineage as the 1979-1986 companion entry. REAL, SPECIFIC, YEAR-GATED DETAIL WITHIN this entry's SPAN: the amplifier's physical location changed mid-generation — behind/below the radio receiver on 1987-1992 cars, then moved UNDER THE PASSENGER SEAT specifically for 1993 cars. A real, checkable, single-year change worth knowing before assuming where to find the amp for a bypass or tap. |
|---|---|
| Adding subs without a head-unit swap | Confirmed straightforward — trunk-based builds don't touch the head unit or Premium Sound amp regardless of its 1987-1992 vs. 1993 location. |
| Head unit | No replacement needed |
No clean published dimensions found, but a real, useful shape constraint: forum sourcing describes a square 12" box as NOT fitting, recommending a wedge-shaped enclosure instead — a single 10" square box may fit where a 12" square one won't. Real documented builder technique: removing the spare tire and building a custom 10" box from 1/4" MDF in that space.
Not independently re-measured — real, likely-similar cargo geometry to the 1979-1986 companion entry's confirmed 32.7 ft3 (seats folded), since both are the same Fox platform hatchback body, but not independently confirmed identical.
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.