Editing Flat-four engine (section)

=== 2000–present===
[[File:Subaru BRZ engine (20413082204).jpg|thumb |2012–present [[Subaru FA engine|Subaru FA]] water-cooled engine]]

By 2000, most manufacturers had replaced flat-four engines with inline-four engines. A notable exception is Subaru, with the water-cooled [[Subaru EJ engine]] being available in turbocharged form in the [[Subaru WRX]] sports sedan and its [[World Rally Car]] counterpart. Subaru's adoption of [[all-wheel drive]] was a factor in retaining the flat-four engine, since the shorter length of this engine assists in fitting the all-wheel drive components into the chassis.<ref name=popsci>{{cite journal |last=Stepler |first=Richard |title=Preview Drive: Three Ways to Get a Grip |journal=Popular Science |date=September 1994 |volume=245 |issue=3 |page=44 |url=https://books.google.com/books?id=RudyJP1ByycC&pg=PA44 |access-date=2011-10-23}}</ref>  Although it is more expensive than an inline-four engine, the flat-four engine allows Subaru to build an all-wheel drive vehicle at little extra cost from two-wheel drive.<ref name=popsci/>

In 2012, a naturally aspirated version of the [[Subaru FA engine]] was used in the [[Toyota 86]] (also called the "Subaru BRZ" and "Scion FR-S") rear-wheel drive sports coupe.<ref name=Bonk>{{cite web |last=Bonk |first=Aaron (2013-02-07) |title=How Boxer Engines Work, And Why You Should Care About Subaru's New FA20 |url=http://www.superstreetonline.com/techarticles/sstp_1301_how_boxer_engines_work/ |access-date=8 January 2014 |date=2013-02-07 |archive-date=2014-02-27 |archive-url=https://web.archive.org/web/20140227052947/http://www.superstreetonline.com/techarticles/sstp_1301_how_boxer_engines_work/ |url-status=dead }}</ref> This engine is water-cooled, has [[gasoline direct injection]], produces {{convert|147|kW|hp|0|abbr=on}} and has a displacement of {{convert|2.0|L|cuin|0|abbr=on}}.

The 2016 [[Porsche 982|Porsche Boxster/Cayman (982)]] mid-engined sports cars downsized from a naturally aspirated flat-six engine to a turbocharged flat-four engine, Porsche's first flat-four since the mid-1970s. This engine is produced in displacements of {{convert|2.0|-|2.5|L|cuin|0|abbr=on}} and produces up to {{convert|365|hp|kW|0|abbr=on}}.<ref>{{cite web | url = http://www.porsche.com/canada/en/models/718/718-boxster/drive/performance/ | title = Performance: The new 718 Boxster | date = 2016 | publisher = Porsche | access-date = 2016-11-01}}</ref> Several reviewers criticised the Boxster/Cayman for an uninspiring engine sound.<ref>{{cite web |title=2019 Porsche 718 Cayman |url=https://www.caranddriver.com/porsche/718-cayman |website=www.caranddriver.com |access-date=1 September 2019 |date=14 May 2019}}</ref><ref>{{cite web |title=Porsche 718 Cayman review – The entry-level Porsche punches above its weight |url=https://www.evo.co.uk/porsche/718-cayman |website=www.evo.co.uk |access-date=1 September 2019 |language=en}}</ref><ref>{{cite web |title=2017 Porsche 718 Cayman First Drive Review: Performance Trumps Sound |url=https://www.motortrend.com/cars/porsche/718-cayman/2017/2017-porsche-718-cayman-first-drive-review/ |website=www.motortrend.com |access-date=1 September 2019}}</ref>

In 2025, Chinese automaker BYD introduced its first flat-four engine in the BYD U7 luxury sedan, marking a modern revival of the boxer engine layout. This water-cooled, turbocharged powerplant combined direct injection and hybrid technology, delivering 268 hp (200 kW) while maintaining a compact design ideal for the sedan’s all-wheel-drive system. The engine drew inspiration from Porsche’s turbocharged flat-four units and showcased BYD’s push into high-performance powertrains alongside its electric vehicle lineup.<ref>{{Cite web |last=White |first=Tom |date=28 March 2025 |title=BYD's new engine shock! New Subaru-style turbo boxer engine headlines unique performance hybrid YangWang U7 sedan as the Chinese brand takes aim at the Porsche Panamera, BMW i7, and Audi e-tron GT |url=https://www.carsguide.com.au/car-news/byds-new-engine-shock-new-subaru-style-turbo-boxer-engine-headlines-unique-performance |url-status=live}}</ref><ref>{{Cite web |last=Lewis |first=William Irvin |date=2025-04-06 |title=Chinese EV Maker Creates 268 HP Turbo Boxer Engine |url=https://www.hotcars.com/byd-creates-boxer-engine/ |access-date=2025-05-10 |website=HotCars |language=en}}</ref>