A cold air intake on the JT Gladiator 3.6L will get you 8–14 horsepower under the right conditions and a throttle response improvement you'll notice in daily driving. It will not transform the truck, and the honest gains are at the top of the RPM range — not where most Gladiator owners spend their time.
The JT's 3.6L Pentastar makes 285 hp factory. The intake system is restrictive by design — FCA optimized it for noise, not airflow. A cold air intake routes the filter box away from underhood heat and uses a larger-diameter intake tube to reduce restriction. The gains are real: third-party dynos from aFe and K&N consistently show 8–12 whp increases on the 3.6L. The throttle response improvement — faster pedal response at light throttle — is arguably more noticeable than the peak power number in street driving.
What a cold air intake won't do: add meaningful low-end torque (the gains are concentrated above 3,500 RPM), improve fuel economy significantly (any gain is offset by the tendency to use the extra power), or change anything about the JT's fundamental character as a truck. The 3.6L Pentastar is an efficient naturally aspirated engine — the intake is the right first modification, but the returns are modest.
**Emission compliance note:** Confirm the intake kit is CARB-compliant if you're in California or another CARB-state. Most major brands (K&N, aFe, Mishimoto) offer CARB-certified versions. An aftermarket intake on a JT that isn't CARB-certified in an emissions-tested state can trigger a check engine light or emissions failure.
1. Disconnect the negative battery terminal. This prevents the ECU from throwing intake MAF codes during the install and resets learned fuel trims so the ECU can adapt to the new airflow characteristics.
2. Remove the factory airbox lid. On the JT 3.6L, the lid is held by two 8mm bolts at the rear and two friction clips at the front. Lift it straight up after loosening.
3. Disconnect the mass airflow sensor (MAF) connector from the factory intake tube. Squeeze the release tab and pull straight back — these connectors are plastic and break if levered sideways.
4. Loosen the hose clamp securing the factory intake tube to the throttle body. Slide the tube off the throttle body elbow.
5. Remove the factory airbox lower section — typically two 10mm bolts into the fender well.
6. Follow the kit-specific instructions for your chosen intake. Most kits route the filter toward the fender or the front of the engine bay with a conical element in place of the factory box.
7. Transfer the MAF sensor from the factory tube to the new tube. Typically two 8mm Torx screws. Handle the MAF element carefully — the sensing wire is fragile.
8. Connect all couplers and tighten hose clamps hand-tight, then snug with a screwdriver (avoid over-tightening rubber couplers — they split).
9. Reconnect the negative battery terminal. Start the engine and check for intake air leaks (hissing sound at idle, rough idle) before driving.
Mishimoto intake: ~$279. Solid OEM+ quality, available in polished aluminum. The value option in this category.
aFe Momentum GT: ~$349. Dyno-tested gains, well-fitting for the JT, available with dry or oiled filter elements.
K&N 77-Series: ~$399. The brand recognition premium is real, but so is the support and filter replacement availability.
Volant with Powercore (sealed): ~$449. The correct choice if the JT sees water crossings. The sealed box provides an air source above the water line and the Powercore filter is dry-element (no oiling required).
Install is consistently under 90 minutes for anyone who's opened an engine bay before. Shop labor for this job is a waste — the complexity doesn't justify it.
| Part | Vendor | Est. price |
|---|---|---|
| K&N 77-Series High Flow Intake — JT Gladiator 3.6L | K&N | ~$399 |
| aFe Power Momentum GT Cold Air Intake — JT 3.6L | aFe Power | ~$349 |
| Volant Cold Air Intake with Powercore Filter — JT 3.6L | Volant | ~$449 |
| Mishimoto Performance Air Intake — JT 3.6L | Mishimoto | ~$279 |
Written and maintained by an AZ wheeler and driveway wrencher. Always cross-reference your factory service manual — modifications affect vehicle safety and warranty. Work at your own risk.