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The highest factory road-car inline-six figures in the sources available here are BMW’s S58 ratings: BMW M lists 550 hp for the M4 CSL, while BMW reports 543 hp for the 2024 M3 CS. That makes the S58 the leader among these cited examples—not a proven all-time champion. A complete record would require comparable ratings across manufacturers, eras, markets, and engine-only versus hybrid systems.
How to compare inline-six power fairly
“Most powerful” depends on what is being counted. A factory road-car engine rating is not directly interchangeable with a hybrid system’s combined output, a tuned build, or a race-only engine. Model year and market matter too: one engine family can receive different calibrations, and published figures may use hp, PS, or kW.
The comparison below keeps the source’s units and identifies the application and context. It is a sourced selection, not an exhaustive ranking. Where a source does not establish a comparable figure, none is inferred.
Factory road-car figures in the cited examples
| Engine and application | Published output | Context |
|---|---|---|
| BMW S58, M4 CSL | 405 kW (550 hp) | BMW M identifies this as the S58’s highest standard configuration in its article. |
| BMW S58, 2024 M3 CS | 543 hp; 479 lb-ft | BMW Group PressClub USA specifies peak torque across 2,750–5,950 rpm. |
| BMW S58, 2021 M3/M4 Competition | 503 hp; 479 lb-ft | An earlier model-year specification from BMW Group PressClub Canada. |
| Toyota B58B30O1, 2025 Supra RZ | 285 kW (387 PS) | Toyota Motor Corporation’s market-specific release. |
| Toyota B58B30O1, 2025 A90 Final Edition | 324 kW (441 PS) | Toyota labels these special-edition figures as prototype/in-house measurements. |
| Toyota 1JZ-GTE, 1999 Mark II | 206 kW (280 PS); 378 Nm | Historical Toyota factory specification, shown in the published units. |
| Mercedes-AMG M256, AMG 53 models | 429 hp engine rating | Car and Driver’s 2018 report describes additional low-rpm motor-generator assistance separately; it is not added to the engine figure here. |
Why the BMW S58 leads this cited road-car comparison
BMW M4 CSL
BMW M lists the S58 in the M4 CSL at the highest standard factory configuration among the cited examples. The figure is for a particular vehicle application, not a universal output for every S58-powered model. BMW’s article also discusses a much higher-output Driftbrothers engine, but that is a modified drift build and does not belong in a production road-car ranking.
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BMW M3 CS and earlier Competition models
The M3 CS and the earlier M3/M4 Competition specifications show how the same engine family’s rating varies by model and year. BMW describes the S58 with a closed-deck crankcase, forged crankshaft, high-pressure injection, and two mono-scroll turbochargers. Its 2021 M3/M4 release additionally notes a 3D-printed cylinder-head core, air-to-water intercooling, and track-oriented cooling. These are design details, not proof by themselves of a particular durability advantage.
A 2020 Society of Automotive Engineers of Japan yearbook lists an earlier S58B30T0 application in the X4 M Competition at 375 kW and 600 Nm. It describes high-pressure injection, Valvetronic, Double-VANOS, and two mono-scroll turbochargers. That dated specification adds technical context; it should not be mistaken for a present-day rating across all S58 applications.
Rank #2
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Hybrid-assisted sixes need a separate comparison
Mercedes-AMG M256
The M256 example is reported with an engine rating and separate motor-generator assistance. Because the cited source does not establish a comparable combined system figure for this table, adding electrical assistance to the engine peak would blur two different measures.
Jaguar Land Rover P400
The 2020 JSAE yearbook describes the P400 as a 3.0-liter turbocharged inline-six with 48-volt mild-hybrid assistance and an electric supercharger. Those features help explain how a modern powertrain can combine combustion and electrical assistance, but the cited material does not provide a comparable output figure for this selection.
Rank #3
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For an engine-only ranking, use the combustion engine’s rated output. For a powertrain comparison, use a clearly stated combined system rating and apply that convention consistently to every vehicle. Do not add a motor-generator’s contribution to an engine rating unless a source explicitly establishes the combined figure.
What the historical Toyota examples establish
1JZ-GTE
Toyota’s 1990 Supra release introduced the 1JZ-GTE as a 2.5-liter, twin-cam, 24-valve twin-turbo inline-six. Toyota’s separate 1999 Mark II specification supplies the historical factory figure shown in the table. Together, these sources document a Toyota turbo-six lineage, but they do not provide a complete history of Toyota inline-sixes or a full specification set for the 2JZ-GTE.
Rank #4
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2025 Supra
Toyota’s 2025 release identifies the B58B30O1 inline-six and distinguishes the regular RZ from the A90 Final Edition. The latter’s published output carries Toyota’s prototype/in-house measurement qualification; it should not be described as an independently verified production test result.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What can—and cannot—be called the most powerful
Within this cited set of factory road-car examples, BMW’s S58 has the top listed standard engine output. The evidence does not establish a definitive all-time record across every inline-six engine, nor a comprehensive ranking of every current engine variant, market, hybrid system, or competition-only application. Treat the result as a qualified comparison of documented examples, not a universal record claim.
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- Compare the same kind of output: engine-only with engine-only, or combined system output with combined system output.
- Keep model year and vehicle application attached to each figure.
- Retain the source’s units unless using a stated, consistent conversion method.
- Keep modified builds and race-only engines separate from factory road-car specifications.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
