Find a trail through the archive.

424 units built (400 Japan-market numbered cars + 24 export) — the most consistently cited "rarest Subaru"

Approximately 1,000 units — UK-only, built by Prodrive specifically to counter grey-market JDM Impreza imports

75 units — built with the storied British tuner Cosworth

500 units — a single-source figure, not independently cross-checked

125 units reported (90 sedans + 35 wagons) — one other source claims 135; unresolved

Subaru's rally-homologated performance icon, built to satisfy World Rally Championship Group A/N rules, and the single family with the deepest JDM-vs-US divergence in the whole marque — from the WRX/STI US introduction gap to a long list of JDM-only limited editions like the 22B.

Turbo comes back to the US Legacy — borrowed straight from the WRX STI.

Subaru's first drivers' champion, winning the 1995 title (co-driver Derek Ringer) in the Group A Impreza 555 — a signature figure in bringing WRC into wider UK/global popular awareness. Moved to Ford for the 1999 season. The research notes this is settled per Wikipedia's team-history article but not yet independently cross-checked against a dedicated WRC.com or FIA historical results archive.

An Impreza-based lifted crossover that became Subaru's entry-level adventure vehicle, with a brief transitional "XV Crosstrek" US badge before "XV" was dropped for MY2016.

The EJ20 is the signature engine of the WRX/STI lineage and the reason Japan and the US ran different WRX/STI displacements for most of the model's history: Japan's road-tax bands and an informal manufacturers' horsepower cap kept JDM cars on the 2.0L EJ20 family all the way to the 2017/2018 S208, the final catalog JDM STI built on it, while the US ran the larger 2.5L EJ25 family from the WRX STI's 2004 introduction. The EJ20's turbo variants powered every Group A/N WRC-homologated Impreza and JDM STI special edition from the 1994 Version 1 onward.

The EJ25 was the mainstream 2.5L engine across US-market Legacy, Outback, Forester, and Impreza applications, and became the US WRX STI's engine from 2004 onward in EJ257 turbo form. Aftermarket-service-industry sources (not a manufacturer statement or independent engineering study) describe two distinct head-gasket failure patterns: internal coolant leaks on 1996–1999 first-generation EJ25D engines, and external leaks around the 100,000-mile mark on later EJ251/EJ252/EJ253 variants — a pattern those same sources say improved with post-2012 revisions and the FA/FB-family replacement, though this remains a service-blog-level claim rather than a rigorously verified one.

The FA20 is the shared engine at the center of the Subaru-Toyota BRZ/86 joint-development program — Subaru supplied the core engine design (on its own Impreza-derived chassis), and Toyota added its D-4S injection system, with the resulting unit carrying two names for one physical engine: FA20 (Subaru) and 4U-GSE (Toyota). Its 86mm-by-86mm bore and stroke is the literal source of the 86 nameplate. A separate turbocharged branch, FA20F/FA20DIT, became Subaru's mainstream direct-injection turbo four across the Legacy GT, Forester XT, and WRX.

The FB family, developed alongside the FA family starting around 2012, replaced the EJ engines across most non-STI Subaru applications and is the direct-injection-capable four-cylinder underpinning the bulk of the modern lineup — Legacy, Outback, Forester, Impreza, and the Levorg (not sold in the US). The Forester's SL generation extends the family into e-Boxer mild- and full-hybrid form, Subaru's first US hybrid powertrains for that model.

A cladding-and-lift trim package that Subaru credits with saving the company.

Confirm the 2013 XV Crosstrek's valve-spring recall (NHTSA 18V-772 / WTY-84) was completed

The generation the US never got the turbo version of.

Ask for head-gasket service history on a 1998–2004 non-turbo Impreza (including the 2.5RS)

The generation where WRX/STI stopped being an Impreza trim.

A Goodwood-displayed Group A Impreza tribute/replica car carries combined 555/Repsol livery and Carlos Sainz/Luis Moya door signage, and is titled on Wikimedia Commons as "1995 Subaru Impreza WRC Group A." That title is inconsistent with the plain-555, non-Repsol livery actually run in the 1995 season — Repsol co-branding is more consistent with the later Sainz-era (1999+) cars. The car should be understood as a tribute/replica display piece with a livery-era mismatch versus its own Commons file title, not asserted as a genuine period 1995 chassis.

A lifted Impreza hatchback, launched under three overlapping names at once.

The current Impreza generation — and the thinnest-researched one in the corpus.

A real plug-in hybrid — but only for California-emission states.

The last US name for the aging Leone platform, discontinued as the Legacy and Impreza took over.

The largest and most established Subaru performance-enthusiast community found in this project's research, covering performance information across nearly the whole Subaru lineup (Impreza, WRX, STI, Legacy, Forester, Tribeca, Baja, SVX) despite its Impreza-focused name. Per its own wiki, founded April 1999 by Alex Shikhmuradov and Robert Eldridge-Waks and formally organized 28 July 1999 — those founder/date specifics come from search-result synthesis of the club's own wiki, not yet independently re-verified, so treat them as provisional.

Won the 2003 drivers' championship with co-driver Phil Mills, beating Sebastien Loeb by a single point and becoming the first Norwegian world rally champion. Drove the "blobeye" Impreza WRC2003 (internally called the "S8" spec in some sourcing), which replaced the earlier round "bugeye" headlamps with single rectangular units. Remained Subaru's lead driver through the team's 2008 withdrawal, partnered at different points with Mikko Hirvonen (2004) and Chris Atkinson (2005-2008).

25 units, roughly £460,000 each — a modern restomod built to mark the 22B's 25th anniversary, not a genuine period factory 22B

Won the 2001 drivers' championship with co-driver Robert Reid, driving the Impreza WRC2001 — the first four-door World Rally Car Impreza, based on the GD-chassis WRX. Also competed for Subaru in the 1999-2000 seasons per the team-history source.

A first-generation-specific community for the GC8-era Impreza and 2.5RS, including dedicated chassis-code-education threads. A longer-tenure niche site rather than a general Subaru forum — comparable in role to a single-generation specialist community.

A taller wagon before 'crossover' was a marketing category.

For 1993 Subaru adopted a blue-and-yellow livery tied to a sponsorship deal with State Express 555, a British American Tobacco cigarette brand — the origin of the "Impreza 555" nickname. The Subaru Impreza 555 debuted at the 1993 1000 Lakes Rally with Markku Alen and Ari Vatanen driving; Vatanen finished 2nd. 555 branding ran 1993-2003 though its prominence dropped after 1999 when BAT redirected sponsorship toward Formula One. From roughly 1999 the livery carried Repsol co-branding alongside the fading 555 marks, tied to Carlos Sainz's personal sponsor from his earlier Toyota/Ford career — the exact transition year from plain-555 to Repsol co-branding is not pinned down by a single source and is treated as provisional (circa 1999+).

Ask any Subaru forum and you'll hear it stated flatly, like a law of physics: the 2.5-liter boxers eat head gaskets. The pattern turns up everywhere you look — everywhere except the one kind of document that would make it official. This is a case file with a strong lead and no smoking gun, and we're not going to pretend otherwise.

The Outback's first factory turbo, and its first six-cylinder as a range-topper.

The chassis where the US got its own S-series STI for the first time ever.

One car, several badges — and a genuine 50/50 joint development.