The 2024 INFINITI Q50 Red Sport 400 is a 400-hp sport sedan, but it is no longer sold new in the United States. A used or certified pre-owned Q50 is the only route; for a current BMW comparison, the 2026 M340i is the closer high-output match than the 330i. The available specifications do not support a numerical comparison with the Audi S4, so check a specific S4’s year and configuration before comparing it.
Which cars are being compared?
“BMW 3 Series” covers models with different power levels. The figures below are useful reference points, not a matched model-year test: INFINITI’s figures are for the 2024 Q50 Red Sport 400, while BMW’s cited M340i figure is from its 2026 U.S. overview. BMW’s 330i figure comes from a technical highlights page whose exact model-year applicability should be checked against the vehicle.
| Model and source context | Published output | What the figure tells you |
|---|---|---|
| 2024 INFINITI Q50 Red Sport 400, U.S. brochure | 400 hp at 6,400 rpm; 350 lb-ft at 1,600–5,200 rpm | A high-output Q50 configuration; actual equipment and drivetrain depend on the car. |
| BMW 330i, BMW USA technical highlights | 255 hp | A lower-output 3 Series alternative, not the closest output comparison to the Red Sport. |
| 2026 BMW M340i, BMW USA overview | 386 hp | The more relevant current BMW comparison on published power; BMW describes a 3.0-liter inline-six with 48V mild-hybrid technology. BMW says its data may be provisional. |
| Audi S4 | Not stated (Audi S4 specifications not established in the available cited material) | Do not infer horsepower, torque, acceleration, fuel economy, price, or availability without a year- and configuration-specific source. |
The output figures make the M340i a more direct high-output comparison than the 330i; they do not establish which car is faster or better. No matched test or aligned-year price comparison is available here.
How much horsepower did the Q50 Red Sport have?
INFINITI’s 2024 Q50 brochure rates the Red Sport 400’s 3.0-liter twin-turbocharged V6 at 400 hp at 6,400 rpm and 350 lb-ft of torque from 1,600 to 5,200 rpm. Those are the manufacturer’s ratings for that model-year trim, not a claim about every Q50 or every Red Sport model year. See the 2024 Q50 specifications and brochure for the source details.
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Red Sport equipment and drivetrain matter
The 2024 brochure also lists Dynamic Digital Suspension, a higher final-drive ratio, and sport brakes with red-painted four-piston front and two-piston rear calipers. Tire fitment differs by drivetrain:
- Rear-wheel-drive Red Sport models use 245/40R19 front and 265/35R19 rear summer run-flat tires.
- All-wheel-drive models use 245/40R19 all-season run-flat tires.
Check the actual car’s drivetrain, wheel and tire fitment before buying replacement tires or assuming its equipment matches another Red Sport.
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Can you still buy an INFINITI Q50?
Not new from INFINITI’s current U.S. range. The company says the Q50 is no longer available as a new model and directs shoppers to Certified Pre-Owned inventory and Q50 manuals. Any purchase is therefore a used-car or CPO decision, and inventory and CPO terms can vary. INFINITI reports an approximate $43,050 starting MSRP for the 2024 Q50; that is historical MSRP context, not a current used-market price or a Red Sport transaction value. See INFINITI’s Q50 page and FAQ.
INFINITI says Q50 models from 2020 onward came with Apple CarPlay and Android Auto. Confirm the model year and installed equipment on the specific vehicle rather than assuming that feature statement covers older cars.
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What the Audi S4 comparison can—and cannot—show
The available Audi material does not establish S4-specific output, acceleration, fuel economy, price, or availability. Those figures should not be filled in from a different model year or a general Audi page. To compare an S4 fairly, identify its model year and configuration, then consult specifications for that exact version.
For ownership information, Audi directs owners to model- and year-specific manuals and maintenance schedules. Audi also says its service network uses factory-trained technicians, Audi-specific tools, and Genuine Audi Parts; this does not establish S4 service costs or relative reliability. See Audi USA service information.
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What to check before buying a used Q50 Red Sport
Compare the individual car, not just the badge. Check:
- VIN, model year, and confirmation that it is a Red Sport 400.
- Whether it is rear-wheel drive or all-wheel drive, and whether the installed tires match the vehicle’s configuration and intended use.
- Equipment and condition, including the suspension and brakes.
- Service records, recall status, asking price, and whether the vehicle is being sold as INFINITI Certified Pre-Owned.
- The owner’s manual and maintenance reference for the exact year and trim; INFINITI provides Q50 manuals through its owner resources.
These checks help establish what a particular car is and how it has been maintained. The cited manufacturer information does not support a comparative reliability ranking or repair-cost verdict for the Q50, BMW 3 Series, and Audi S4.
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How to make a fair comparison
- Choose exact years and trims. The 2024 Q50 Red Sport and 2026 M340i figures are not an aligned-year comparison. Specify the year and configuration for every car.
- Separate the 330i from the M340i. Use the 330i as a lower-output 3 Series reference and the M340i as the closer high-output BMW comparison.
- Confirm drivetrain and equipment. In particular, verify the Q50’s RWD or AWD configuration and tire setup against the actual vehicle.
- Compare the specific Audi S4 version. Obtain year-specific specifications before making claims about its output or performance.
- Evaluate the purchase on current evidence. Compare actual asking prices, condition, service documentation, and equipment; the historical Q50 MSRP is not a substitute for current listings.
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.
