In most street applications, an aftermarket intake yields modest horsepower gains—roughly 5–15 horsepower at the crank on a naturally aspirated engine, with results varying by vehicle and setup. Turbocharged engines typically see smaller gains unless paired with a tune and other modifications.
What an intake does
An intake works by increasing the volume of air that reaches the engine and reducing airflow restrictions. More efficient air delivery can improve combustion efficiency, throttle response, and top-end power. However, the actual horsepower gain depends on several factors, including the engine design, tuning, and whether the stock system was already optimized for performance.
Types of intake designs
Different designs aim to balance power, reliability, and reliability under heat. Cold-air intakes (CAI) try to pull cooler air from outside the engine bay, while short-ram intakes keep the intake closer to the engine, sometimes risking heat soak. Velocity stacks and featherweight housings can improve airflow at high rpm, but gains vary by application and may require calibration to maximize benefits.
Expected horsepower gains by engine type
General ranges you might see on popular street builds, noting that actual results depend on the specific car, the rest of the exhaust/tune, and testing conditions:
- Naturally aspirated engines: typically 5–15 horsepower at the crank; 3–12 horsepower at the wheels on many dynos. Gains are sensitive to the stock intake’s restriction and to any accompanying exhaust or tuning changes.
- Turbocharged or supercharged engines: commonly 0–15 horsepower at the crank without additional modifications; more often in the 5–15 range with a tune or when the stock intake was notably restrictive. Dramatic gains (>20 hp) usually require a supporting ECU tune, upgraded intercooling, or other hardware changes.
- Diesel engines: often modest gains in the single digits to low teens at the crank, with real-world effects more noticeable in throttle response and peak airflow than outright peak horsepower.
Note: These figures are indicative. Real-world dyno results vary widely based on the vehicle, testing method, ambient conditions, and whether a tune accompanies the intake install.
What to consider before you buy
Several factors influence whether an intake will deliver meaningful performance benefits for your car—and what you should plan for beyond the sticker price.
- Tune requirements: Many intakes deliver the largest gains only after ECU calibration. Without a tune, you may see little or no improvement and, in some cases, potential drivability concerns.
- Warranty and emissions: Aftermarket intakes can affect warranties in some regions and may have implications for emissions testing. Check local rules and your vehicle’s warranty status before proceeding.
- Fitment and heat management: The placement of the intake and its distance from heat sources matter. Cold-air routes can deliver cooler air but may be less practical in hot climates or tight engine bays.
- Maintenance and filtration: Some high-flow filters require more frequent cleaning, and improper installation can lead to debris ingestion or sensor issues.
- Cost versus potential gain: Compare the price of the intake and any required tuning against the expected horsepower and throttle response benefits for your specific vehicle.
When evaluating options, consider your goals (throttle response, top-end power, or a balanced feel), your engine’s architecture, and whether you plan additional upgrades such as exhaust or a tune to maximize the gains.
How to evaluate gains on your car
To verify any gains, run a controlled dyno test before and after installation whenever possible. If a dyno pull isn’t feasible, track throttle response and fuel economy changes across a consistent driving routine to gauge subjectively how the upgrade affects day-to-day performance.
Be mindful that heat soak, altitude, and ambient temperature can skew results. A gain observed on a cool day on a dyno may be less noticeable on a hot afternoon on the street.
Summary
For most street-driven cars, an intake adds modest horsepower—roughly five to fifteen horsepower at the crank for naturally aspirated engines, with turbocharged setups typically needing a tune to realize similar gains. The actual effect depends on engine design, the specific intake, tuning, and how the vehicle is tested. Always weigh the potential performance benefits against cost, warranty, and maintenance considerations, and consider a dyno-based verification to confirm real-world gains.
Is 5000 hp possible in a car?
A Monster V16 Built In The USA
Morris, known for record-breaking drag racing engines, took on the challenge of creating a 12.3-liter V16 with four turbos strapped to it. On a dyno, the engine reportedly made just over 5,000 horsepower at full tilt, proving at least part of Devel's claim was possible.
How do you add 50 hp to your car?
Supercharger or turbocharger
A turbocharger works with the exhaust system and can potentially give you gains of 70-150 horsepower. A supercharger is connected directly to the engine intake and could provide an extra 50-100 horsepower.
How much HP do intakes give you?
between 5 to 15 horsepower
When upgrading your air intake, truck owners can expect an increase of between 5 to 15 horsepower, though this number can be higher or lower depending on your make, model, engine size, and type of intake. This change can be credited to several factors, including the location of the upgraded air intake.
Is a cold air intake a felony?
The answer largely depends on where you live. While many states have no restrictions to air intake upgrades, several other states do—and it all starts with California.