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The highest verified engine-only figure in this comparison is 523 hp for the BMW M3 Competition xDrive. This is a comparison of manufacturer specifications for selected U.S. and Canadian models—not a verified worldwide inventory of every inline-six vehicle still on sale. Hybrid-system totals are shown separately from engine output.
Inline-six engines ranked by engine horsepower
The ranking uses the horsepower attributed to the inline-six engine, not a hybrid system’s combined output. Model year and market are included because specifications can differ between versions and regions. Manufacturer pages and announcements establish the figures below, but do not by themselves confirm that every listed trim remains orderable on October 4, 2026.
| Rank | Vehicle and version | Inline-six engine output | Market and model-year context | Source and qualification |
|---|---|---|---|---|
| 1 | BMW M3 Competition xDrive | 523 hp | United States; BMW USA current M model page, accessed 2026. Exact model-year availability is not established. | BMW USA lists 523 hp; BMW’s 2025 FAQ identifies the relevant engine as an inline-six. |
| 2 | BMW M3 Competition Sedan | 503 hp | United States; BMW M3 documentation includes 2025 material. Confirm the precise model year and configuration locally. | BMW material identifies the M3 engine family as inline-six. |
| 3 | BMW M2 Coupe; BMW M3 Sedan; BMW M4 Coupe | 473 hp each | United States; current BMW M examples, with exact year and trim dependent on listing. | BMW’s current M page gives these model examples; BMW FAQ/specification material identifies the relevant engines as inline-six. |
| 4 | Mercedes-AMG E 53 Hybrid Wagon | 443 hp | United States; 2026 model, announced by Mercedes-Benz USA in 2025. | Mercedes-Benz USA quotes 443 hp for the engine. The separately stated hybrid-system outputs are 577 hp combined, or 604 hp with optional RACE START. |
| 5 | Toyota GR Supra 3.0 | 382 hp | Canada; 2026 specification. | Toyota Canada lists 382 hp. Toyota Global has separately announced other market/version figures, which are not interchangeable with this Canadian rating. |
| 6 | Mercedes-Benz E 450 4MATIC Sedan | 375 hp | United States; current E-Class page, accessed 2026. | Mercedes-Benz USA specifies a 3.0-liter turbo inline-six with mild-hybrid drive. |
| 7 (tie) | Mazda CX-70 3.3 Turbo S; Mazda CX-90 3.3 Turbo S | 340 hp each | United States; 2026 model pages. | Mazda USA lists up to 340 hp for the CX-70 Turbo S and 340 hp for the CX-90 Turbo S. Mazda recommends premium fuel for the CX-90 Turbo S. |
| 9 (tie) | Mazda CX-70 3.3 Turbo; Mazda CX-90 3.3 Turbo | 280 hp each | United States; 2026 model pages. | The standard Turbo tune is 280 hp. Mazda’s CX-70 FAQ says both models’ trims use a 3.3-liter turbo inline-six with a 48-volt mild-hybrid system; Mazda specifies regular fuel for the CX-90 standard Turbo. |
How to read the horsepower figures
Engine output is not hybrid-system output
The Mercedes-AMG E 53 Hybrid Wagon illustrates the distinction: its inline-six is rated at 443 hp, while the hybrid system is quoted at 577 hp combined, rising to 604 hp with optional RACE START. It ranks here at 443 hp because this table compares engine output. The larger figures describe the system under the stated conditions, not the engine alone.
Market and model year affect the comparison
The Toyota figure is Toyota Canada’s rating for the 2026 GR Supra 3.0. Toyota Global’s announcement gives separate outputs for other versions, including a special edition; those figures should not be substituted for the Canadian specification. BMW’s supporting material spans current model pages and 2025 documentation, so the listed power ratings should not be read as confirmation of 2026 orderability for each trim.
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#1 Best Overall
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Trim and tune matter as much as engine layout
These examples range from the 280-hp Mazda Turbo tune to the 340-hp Turbo S and BMW M variants rated as high as 523 hp. The Mazda CX-90’s fuel guidance also differs by tune: Mazda says regular fuel for the standard Turbo and recommends premium for the Turbo S. A vehicle’s inline-six configuration alone does not determine its output or fuel guidance.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What this ranking can—and cannot—establish
The table is a manufacturer-sourced North American comparison subset, not a complete global leaderboard. The available specifications do not verify every inline-six model currently orderable worldwide, and a specification page or announcement is not proof that a particular trim can still be ordered in every market. Confirm the exact local model year, trim, drivetrain and availability with the manufacturer or a local dealer before treating a rating as a current purchase option.
Quick Recap
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