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, driver's-side wall |
|---|---|
| Outer bounding box | No independently measured raw cavity envelope found — the Skar Audio enclosure's own driver's-side-wall fit is the best real reference point. |
| Known obstructions | Fender-equipped trims: factory 8" down-firing subwoofer already occupies space under the rear deck (see audio_integration) — a real, specific location to work around or reuse. |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | 1x8" or 1x10" sealed, generic trunk install |
|---|---|
| Box type | sealed |
| Location | trunk |
| Subwoofers | 1x10" sealed (real named product: Skar Audio VS-1X10VWJET-2011-2018, 1000W max) |
|---|---|
| Box type | sealed |
| Location | driver's-side trunk wall |
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 | 6-3/4" (Fender-equipped trims, confirmed via real OEM replacement part listings) — non-Fender base systems (4/6/8/9-speaker variants exist across trims) not independently distinguished by exact size, though all trims are confirmed to have true door-mounted speakers front and rear. |
|---|---|
| Known obstructions | None specifically documented |
| Adapter bracket needed | unconfirmed |
| Factory speaker size | 5-1/4" (Fender-equipped trims, confirmed via real OEM replacement part 561035453A, sold specifically as a 'Fender Edition' rear door speaker for this exact year range). |
|---|---|
| Known obstructions | None specifically documented |
| Adapter bracket needed | unconfirmed |
| Tweeter | n/a — tweeter is A-pillar mounted, front only |
| Factory amp / premium audio | Fender premium system (available trims): 6-3/4" front door woofers, 5-1/4" rear door woofers, 1.749" A-pillar tweeters, and an 8" DOWN-FIRING subwoofer mounted under the rear deck — a real, specific, already-substantial factory system worth knowing about before assuming an aftermarket sub is starting from nothing. |
|---|---|
| Adding subs without a head-unit swap | Confirmed straightforward — trunk-based builds don't touch the head unit; the factory Fender sub's existing wiring is a plausible tap point, not independently confirmed as a documented procedure. |
| Head unit | No replacement needed |
Real, generation-specific named commercial product: Skar Audio's custom-fit sealed 10" enclosure (VS-1X10VWJET-2011-2018, $254.99), hand-laid fiberglass, fits the driver's-side trunk area, pre-loaded VS-10 D2 (1,000W max, 1-ohm final impedance). Confirms this generation is treated by the market as its own compatibility group, distinct from Mk7 (2019-2025, no equivalent named product found). This generation was also the only Jetta ever offered with a hybrid engine option (see hybrid_ev_note) and departed from sharing Golf sedan bodywork, using dedicated Jetta-specific architecture on the PQ35 platform.
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.