How much horsepower does a 5.7 Hemi cold air intake add?

On a stock 5.7 Hemi, a quality cold air intake typically adds about 5–10 horsepower at the wheels (roughly 8–15 hp at the crank), with peak gains sometimes touching the low teens under ideal conditions; bigger numbers are possible when paired with a tune and exhaust. This estimate covers popular 5.7 Hemi applications like Ram 1500, Dodge Charger, and Challenger, and reflects real-world dyno results rather than only manufacturer claims.

What a cold air intake does

A cold air intake (CAI) reduces intake restriction and, when well-designed, feeds the engine cooler, denser air. On modern Hemis, that primarily improves airflow and can slightly optimize the air charge temperature entering the manifold. The ECU’s adaptive fueling typically takes advantage of the extra airflow, yielding a modest bump in horsepower and torque, plus crisper throttle response.

Typical horsepower gains on a stock 5.7 Hemi

For an otherwise stock 5.7 Hemi, independent chassis-dyno tests commonly show 5–10 wheel horsepower (whp) and a similar single-digit torque increase, most noticeable in the midrange. Some CAI systems can show brief peak gains above 10 whp under cooler ambient temperatures or with the hood open on a dyno. At the crank, that translates to roughly 8–15 hp. Expect the biggest seat-of-the-pants difference in throttle response and induction sound, with small but measurable power gains at higher rpm.

Real-world dyno ranges

The following points summarize reported ranges enthusiasts and tuners often see across popular 5.7 Hemi platforms, recognizing that exact results vary with weather, fuel, and test methodology.

• Ram 1500 5.7 Hemi: +5–9 whp typical; occasional peaks around +10–12 whp with cooler intake designs and favorable conditions.
• Dodge Charger/Challenger 5.7 Hemi: +6–10 whp typical; +10–13 whp possible with a tune or on cars with other breathing mods.
• Crank vs. wheel: Manufacturer “up to” claims often reflect peak wheel gains on a specific vehicle and dyno; real-world averages skew lower.
• Torque: +5–12 lb-ft in the midrange is common, improving drivability even if headline horsepower gains are modest.

These ranges assume a healthy engine, proper installation, and similar baseline conditions between before-and-after pulls.

Factors that affect gains

Multiple variables can raise or lower the horsepower increase you’ll see from a CAI on a 5.7 Hemi. Understanding them helps set realistic expectations.

• Intake design and placement: Sealed boxes drawing fender or grille air tend to resist heat soak better than open filters in the engine bay.
• ECU calibration and adaptivity: The 5.7 Hemi’s speed-density strategy can adapt to added airflow; a custom tune can unlock a bit more.
• Ambient temperature and vehicle speed: Colder, moving air improves density and reduces under-hood heat, increasing gains.
• Supporting mods: Cat-back exhausts, long-tube headers, and higher-flow intake manifolds amplify the CAI’s benefit.
• Test conditions: Heat-soaked engines and high intake air temperatures suppress dyno numbers; consistent A/B testing is critical.
• Filter condition: A clean, properly oiled (if applicable) filter maintains designed airflow; over-oiling can cause sensor issues.

In short, the cleaner and cooler the intake charge—and the more the total system flows—the better the outcome.

When you’ll see more than “just a few” horsepower

While a standalone CAI provides modest gains, pairing it with complementary modifications and tuning can raise the total improvement appreciably.

• CAI + custom tune: Often nets around 10–15 whp over stock, sometimes a touch more at peak rpm.
• CAI + cat-back exhaust + tune: Commonly 12–20 whp combined over stock, with broader midrange torque.
• CAI + headers (shorty or long-tube) + high-flow cats + tune: Meaningful improvements in both peak and area-under-the-curve power.
• E85 flex-fuel tune (where supported): Can further enhance gains if fueling and ignition are optimized.

These combinations don’t change the CAI’s standalone value; they showcase how it contributes to a freer-breathing, tuned package.

Brand claim snapshots

Manufacturers publish “up to” figures measured on specific vehicles and dynos. These can exceed average user results but indicate what’s achievable under ideal conditions.

• K&N: Frequently advertises double-digit wheel gains on certain Ram 1500 5.7 applications (for example, figures around +15 whp on select late-model trucks).
• aFe: Lists gains such as +18 hp and +22 lb-ft on some Charger/Challenger 5.7 kits, typically with sealed Momentum-series boxes.
• S&B: Emphasizes large airflow increases with sealed airboxes; dyno improvements are generally mid–single to low–double-digit whp depending on application.

Treat these as best-case peaks. Independent dyno averages often settle closer to the 5–10 whp range for a stock engine.

Beyond horsepower: what you’ll notice

Even when the dyno gain is modest, owners often report other tangible differences after installing a CAI.

• Sharper throttle response and slightly quicker revving, especially off-idle and in the midrange.
• Deeper induction sound under load, without adding drone like some exhausts can.
• Potentially small fuel economy changes—often neutral to slightly positive on highway cruises, driver-dependent.
• Serviceable or washable filters can reduce long-term maintenance costs if maintained properly.

These changes contribute to a sportier feel, which many drivers value as much as the dyno number.

Installation and cost

Most bolt-on CAI kits for the 5.7 Hemi install with basic tools in under an hour. The process is straightforward but should be done carefully to avoid air leaks.

1. Remove the factory airbox, snorkel, and intake tube; retain hardware as specified.
2. Assemble the new airbox and tube per instructions, transferring sensors and grommets.
3. Install the filter, position the box for proper seal to the fender/grille, and tighten clamps.
4. Reconnect sensors and verify no wiring is pinched; clear the area of tools and debris.
5. Start the engine, check for vacuum leaks, and take a short test drive to confirm fitment.

Typical kit pricing ranges from about $250 to $500+, depending on brand, materials, and whether the design uses a sealed box or open element.

Downsides and caveats

While generally safe and simple, CAIs carry a few considerations owners should weigh before installing.

• Heat soak: Open-element designs can ingest warmer engine-bay air at low speeds, cutting into gains.
• Water ingestion risk: Aggressive fender-well or low-mounted intakes can be vulnerable in deep standing water.
• Sensor and emissions: Over-oiled filters can contaminate sensors; ensure the kit is emissions-legal (CARB EO) if required in your state.
• Warranty: Magnuson–Moss protects you from blanket denials, but dealers may scrutinize powertrain claims; keep stock parts for reversibility.
• Noise: Induction sound increases under throttle; most drivers like it, but cabin NVH will rise.

Choosing a sealed, CARB-certified kit and following maintenance instructions mitigates most of these concerns.

Bottom line

Expect about 5–10 whp from a cold air intake on a stock 5.7 Hemi, with occasional higher peaks under ideal conditions. The upgrade shines most when paired with a tune and other breathing mods, and it reliably improves throttle response and induction sound. If you value those benefits and want a foundation for future performance work, a well-designed CAI is a sensible first step.

Summary

A cold air intake on a 5.7 Hemi typically adds 5–10 wheel horsepower (around 8–15 at the crank), with higher peaks possible in ideal scenarios or when combined with tuning and exhaust. Gains vary by design, conditions, and supporting mods; sealed systems generally perform more consistently. Beyond raw power, expect crisper response and a richer intake note, with straightforward installation and manageable trade-offs.

How much HP does a tune add to a 5.7 Hemi?

A simple ECU (electronic control unit) tune, sometimes called a “Stage 1 tune,” can add around 5 to 40 horsepower to a 5.7 Hemi engine, with higher gains requiring higher-octane fuel. However, the exact amount of horsepower and torque gained depends heavily on the specific tune, the supporting modifications on the engine (such as exhaust, headers, and intake), and the fuel quality used. For example, combining a tune with long-tube headers and a performance cam can significantly increase power, while a basic off-the-shelf tune will offer more modest improvements. 
Factors influencing power gains:

• Type of tune: Off-the-shelf tunes provide less power than custom tunes, which are developed with a specific engine and fuel in mind. 
• Supporting modifications: Adding long-tube headers, a performance camshaft, or a cold-air intake will further increase the potential power gains from a tune. 
• Fuel quality: Higher-octane fuels like 91 or 93 octane are necessary for maximizing the power gains from a tune and other modifications. 
• Baseline power: The stock power output of a 5.7 Hemi varies by year and model, so the percentage of gains from a tune will differ. 

Examples of gains from a tune:

• Basic tune: A basic, off-the-shelf tune with 91 or 93 octane fuel can add about 5 to 15 wheel horsepower. 
• Stage 1 Tune: This can increase overall output by approximately 25 to 40 horsepower. 
• Performance tune: With long-tube headers and a custom tune, power gains could reach 30 horsepower to the wheels. 
• Combined modifications: Adding a cam, MDS delete, and custom tune has shown significant power increases in some applications. 

To get the most from a tune:

1. Start with high-quality fuel: Always use 91 or 93 octane fuel to get the most from your tune. 
2. Consider supporting modifications: Long-tube headers, a performance cam, and a cold-air intake will allow the tune to work more effectively and unlock greater power. 
3. Get a custom tune: For the best results, a professional tuner should develop a custom tune specifically for your vehicle and its modifications. 

How much HP does cold air intake add to 5.7 Hemi?

A cold air intake typically adds between 5 to 20 rear-wheel horsepower (RWHP) to a 5.7L Hemi engine, though the actual gain can vary depending on the specific intake system, the vehicle model, and whether a tuning is applied. While the advertised gains vary by manufacturer, expect increases in the lower to mid-tens of horsepower, with some high-performance systems potentially reaching the upper end of that range. 
Factors influencing horsepower gains:

• Specific Cold Air Intake (CAI) System: Opens in new tabDifferent brands and models are engineered with different materials and designs, leading to varying levels of performance. 
• Vehicle Application: Opens in new tabThe specific Dodge, Ram, or other vehicle the engine is in will also affect the gains. 
• Tuning: Opens in new tabWhile many CAI systems can provide benefits without a tune, a custom engine tune can unlock even greater horsepower and torque gains by optimizing the air-fuel mixture for the increased airflow. 
• Engine and Vehicle Condition: Opens in new tabThe overall condition of the engine and other components can also play a role in how much of an improvement is seen. 

What to expect:

• Sound: Opens in new tabYou’ll likely notice a more aggressive and deeper engine sound, which is one of the most immediate and obvious benefits. 
• Throttle Response: Opens in new tabMany users report improved throttle response and a more engaged feel when accelerating. 
• Fuel Economy: Opens in new tabWhile some manufacturers claim improved fuel economy, the actual benefits vary and are often minimal compared to the power gains. 

Considerations:

• Stock Components: Modern 5.7L Hemi engines from the factory are already quite efficient at drawing in cold air. 
• Tuning Benefits: To maximize the performance of a cold air intake, pairing it with a custom tune is often recommended. 
• Manufacturer Claims: Always check the specific manufacturer’s claims and look for third-party dyno tests to verify performance gains for your specific vehicle. 

How to increase 5.7 Hemi HP?

To increase horsepower on a 5.7L Hemi, you can start with a cold air intake and a performance tuner for an easy, foundational upgrade. For more significant gains, add long tube headers and a full exhaust system. Further power increases can be achieved with a camshaft upgrade, ported intake manifold, or forced induction options like a supercharger. A comprehensive approach involves combining these components with professional tuning to unlock the engine’s full potential.
 
Bolt-On Upgrades
These are the first steps to improving airflow and efficiency without opening the engine. 

• Cold Air Intake: Replaces the stock intake with one that allows more unrestricted airflow, increasing throttle response and efficiency. 
• Performance Tuner: A handheld device or software that can adjust engine parameters to optimize performance after other modifications, such as headers, are installed. 
• Long Tube Headers: Replace restrictive factory exhaust manifolds, significantly improving exhaust flow to free up hidden horsepower. 
• Cat-Back Exhaust: Enhances the exhaust system’s sound and also improves airflow for better performance and fuel economy. 
• Ported Throttle Body: A performance-oriented 5.7L Hemi throttle body or ported stock throttle body can provide greater airflow. 

Engine Internals & Forced Induction
These upgrades offer more substantial power gains and often require professional installation. 

• Camshaft Upgrade: Opens in new tabA performance-tuned camshaft can significantly increase horsepower, though it may affect low-end torque. 
• MDS Delete Kit: Opens in new tabFor some builds, a kit can be installed to remove the Multi-Displacement System (MDS) for improved performance. 
• Supercharger: Opens in new tabAdding a supercharger kit, such as those from ProCharger, is a way to add significant forced induction and create a powerful engine, requiring supporting modifications like upgraded fuel pumps and injectors. 
• Methanol-Water Injection: Opens in new tabThis kit can be used to cool intake charge temperatures and increase octane for more power, especially in forced induction applications. 

Supporting Systems
Upgrading these components ensures the engine’s power can be effectively delivered and controlled. 

• Performance Fuel System: Opens in new tabHigh-volume fuel pumps and larger injectors may be needed to supply the increased fuel demands of a supercharged Hemi. 
• Transmission Upgrades: Opens in new tabFor high-horsepower builds, components like a high-stall torque converter and a transmission cooler may be necessary. 
• Differential & Driveline: Opens in new tabUpgrading the differential with a limited-slip differential (LSD) and reinforcing the driveshaft can help handle increased power. 

Is a cold air intake worth it on a 5.7 hemi?

A cold air intake is a worthwhile modification on a 5.7L Hemi if your goal is an improved engine sound, enhanced throttle response, and a cleaner look under the hood. While it can offer some performance benefits and a slight increase in fuel efficiency, the actual power and MPG gains are often marginal without a supporting engine tune, and some users consider it a low-impact upgrade for the cost. 
Benefits

• More Aggressive Sound: A cold air intake will give the Hemi a deeper, more aggressive exhaust note, especially during acceleration. 
• Improved Throttle Response: The better airflow can make the engine feel more responsive to your input on the gas pedal. 
• Enhanced Appearance: Many aftermarket intakes offer a more attractive and polished look under the hood compared to the stock setup. 
• Better Air Filtration: The high-flow, reusable filters included with many kits can provide better protection than stock paper filters. 

Considerations & Limitations

• Modest Performance Gains: Don’t expect significant horsepower or torque increases without a custom ECU tune. A cold air intake alone provides minimal gains in these areas. 
• Fuel Efficiency: While some claim increased MPG, the gains are typically small and may be offset by driving habits. 
• Cost vs. Impact: A cold air intake is often a first modification for daily drivers, but for pure performance, it’s a modest gain for the investment. 
• Need for a Tune: To truly capitalize on the increased airflow and maximize the benefits, a custom tune is highly recommended. 
• Not a Magic Bullet: If you are looking for substantial, noticeable power gains on a naturally aspirated engine, a cold air intake alone will likely not be enough. 

In summary, a cold air intake is a worthwhile mod for the Hemi if you value the sound, aesthetics, and improved throttle response as much as, or more than, significant horsepower gains.