Cold Air Intake vs Short Ram Intake: Which Makes More Power?
Both are popular mods, but they work differently — and one consistently outperforms the other on the HEMI. Here's what the dyno data actually shows and which intake setup is worth your money.
The Theory Behind Each Design
Both intake types replace the restrictive factory airbox with a performance filter and tube. The difference is where the filter lives.
Short Ram Intake (SRI): Filter sits in the engine bay close to the throttle body. Simple installation, looks impressive, easy access. The downside: the engine bay on a running HEMI reaches 180–220°F. Hot air is less dense than cold air — less oxygen per cubic foot — so the engine makes less power.
Cold Air Intake (CAI): The filter is routed away from the engine bay — often into the fender well or in front of the radiator — where air is significantly cooler (ambient outside temperature). Cooler, denser air means more oxygen and more power.
What the Dyno Shows
On a 5.7L or 6.4L HEMI with a proper tune:
| Intake Type | Typical Gain (WHP) |
|---|---|
| No tune, stock airbox | Baseline |
| Short Ram Intake, no tune | 5–8 WHP |
| Cold Air Intake, no tune | 8–14 WHP |
| Short Ram + tune | 10–15 WHP |
| Cold Air + tune | 15–25 WHP |
The CAI consistently outperforms the SRI, particularly in warm ambient temperatures. The gap narrows in cold weather (when bay temps are lower) but CAI still typically wins.
Heat Soak
Heat soak is the critical issue with short ram intakes. After sitting in traffic or returning from a spirited run, an SRI filter absorbs so much ambient bay heat that power drops significantly — sometimes below stock levels temporarily. CAIs experience far less heat soak because the filter is isolated from the hot engine bay.
Popular Cold Air Intake Choices for the Challenger
Corsa Performance Closed Box CAI: One of the best-engineered options. True closed box isolates the filter from bay heat. Available for 5.7 and 6.4. ~$400–$500.
S&B Filters Intake: Uses a massive filter with excellent airflow characteristics. ~$350–$425.
K&N 77 Series Intake: Proven brand, good gains, widely available. ~$350–$450.
AFE Momentum GT: Popular choice, good dyno numbers, good filter life. ~$350–$450.
The Filter: Dry vs Oiled
Most aftermarket filters use an oiled cotton gauze element. These require periodic cleaning and re-oiling (every 50,000 miles or per manufacturer's interval).
Dry filters (like some Donaldson or AEM Dryflow) require no oiling and are often preferred in dusty environments. Slightly lower peak flow than oiled but more consistent filtration.
Do You Need a Tune With an Intake?
An intake alone on a 2022 Challenger will produce gains — the PCM has enough adaptive capacity to make use of additional airflow. But a custom tune on 93 octane that accounts for the new intake will extract 50–100% more power from the same hardware. Intake + tune is the standard recommendation.
Verdict
On a HEMI, a closed-box cold air intake consistently outperforms a short ram intake. The extra cost (typically $50–$100 more) is worth it for both the power advantage and the reduced heat soak. If you're choosing between the two, go cold air.
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