Prerequisites and Safety Considerations

Before attempting any performance modifications on your Ram 1500 TRX, you must understand the risks and requirements. Adding 80 horsepower is a substantial increase that demands careful component selection and precise installation. Always work on a level surface with the engine completely cool. Disconnect the battery negative terminal before touching any electrical systems. Use jack stands if the vehicle needs to be raised—never rely solely on a floor jack. Also check your local emissions laws, as some modifications may not be street-legal in certain states.

Ensure you have a suitable workspace with good lighting and ventilation. Allow a full weekend for the installation, especially if you are not a professional mechanic. Having a second pair of hands can save time and prevent mistakes. Keep a fire extinguisher rated for Class B (flammable liquids) and Class C (electrical) nearby, as fuel and electrical work are involved.

Understanding the 80 hp Goal

The Ram 1500 TRX comes factory-rated at 702 horsepower from its supercharged 6.2-liter HEMI V8. An additional 80 horsepower brings the output to around 782 hp—a level that stresses drivetrain components. Your transmission, axles, and cooling system must handle this extra power. A dyno-verified increase means the gains are measured on a chassis dynamometer, not just claimed by parts manufacturers. This guide focuses on a proven combination of intake, exhaust, and ECU tuning.

The key to reaching 80 wheel horsepower (whp) is synergy. Cold air intake, high-flow exhaust, and a custom tune must work together. Some tuners also recommend upgrading the supercharger pulley or adding a heat exchanger, but those steps go beyond this 80 hp scope and may void the factory warranty. Always confirm that your chosen parts are compatible with the TRX’s supercharged engine management system.

Tools and Parts Checklist

Required Tools

  • Metric and SAE socket sets with extensions (1/4”, 3/8”, and 1/2” drives)
  • Torque wrench capable of 20–150 ft-lb (N·m equivalents)
  • Flathead and Phillips screwdrivers, plus Torx bits (T25, T30, T45)
  • Oxygen sensor socket (22mm or 7/8”)
  • Trim removal tools (plastic pry bars)
  • Jack stands and a hydraulic floor jack
  • Safety glasses and mechanic’s gloves

Required Parts

  • Cold air intake system designed for the 6.2L supercharged HEMI (e.g., AFE, Roto-Fab, or S&B)
  • High-flow cat-back exhaust system (e.g., Borla, Corsa, MBRP) or a full turbo-back system (if emissions compliant)
  • ECU tuning device (e.g., HP Tuners, DiabloSport Trinity, or a custom tune from a reputable shop like Livernois or Hennessey)
  • Replacement gaskets for exhaust flanges and intake manifold (if required)
  • Fuel system cleaner or octane booster for the initial dyno tuning session

Note: Some tuners provide a handheld programmer that includes pre-loaded dyno-verified tunes. Choose a tuner who has proven results on the TRX platform. Do not rely on “generic” tunes found in forums—they can cause detonation or lean conditions.

Step 1: Vehicle Preparation and Data Logging

Start by driving the TRX to a full warm-up (coolant temperature above 190°F). Park on a level surface, shut off the engine, and disconnect the battery negative terminal. Wait at least 10 minutes for the supercharger intercooler system to cool down. Remove the engine cover (unscrew the four bolts and lift off).

Before removing any factory parts, take baseline dyno runs if possible. Many tuners require a log of stock boost pressure, air/fuel ratio, and ignition timing. If you don’t have access to a dyno, use the tuning software’s data logging feature during a safe WOT (wide-open throttle) pull on a closed road. Record at least three pulls to establish a baseline. This data ensures your 80 hp gain is real and not offset by pre-existing issues like a clogged air filter or knock.

Step 2: Cold Air Intake Installation

Removing the Stock Intake

Locate the factory airbox on the passenger side of the engine bay. Remove the air duct connecting the throttle body to the airbox. Use a flathead screwdriver to release the hose clamps. Disconnect the MAF sensor connector (press the tab and pull gently). Take care not to damage the sensor. Unbolt the airbox from the fender well (three 10mm bolts). Lift the airbox out, including the filter element.

Inspect the throttle body for dirt or oil residue. Clean the throttle body bore with a lint-free cloth and throttle body cleaner if needed. Do not spray cleaner directly onto the electronics.

Installing the Aftermarket Intake

Follow the manufacturer’s instructions closely, but general steps include:

  1. Mount the new airbox bracket (if supplied) to the factory location using existing holes or included hardware.
  2. Attach the new filter to the intake tube. Ensure the filter is pre-oiled (if oiled type) or clean accordingly.
  3. Slide the intake tube onto the throttle body. Tighten the clamp securely but avoid overtightening that may warp the throttle body.
  4. Reconnect the MAF sensor. Check for any vacuum line connections that may need to be transferred.
  5. Inspect all couplers and clamps for leaks. Pressurize the system with a boost leak tester if available.

Pro tip: After installation, start the engine and let it idle for 30 seconds. Listen for whistling or hissing sounds indicating a loose coupling. A cold air intake on a supercharged engine can also cause an audible increase in supercharger whine—this is normal.

Step 3: High-Performance Exhaust Upgrade

Removing the Factory Exhaust

Raise the rear of the truck securely on jack stands, ensuring the frame is supported. The TRX has a dual exhaust system. Start at the muffler area: spray penetrating oil on all bolts and hangers (allow 10 minutes to soak). Use a 15mm or 13mm socket to remove the hanger bolts. Cut the factory exhaust only if necessary—many aftermarket systems are designed to bolt directly to the existing mid-pipe. Remove the rear mufflers and tips carefully. For a cat-back system, the mid-pipe will be replaced as well.

Installing the Aftermarket System

  1. Lay out all new exhaust components. Verify each piece matches the system diagram.
  2. Install new gaskets at the flange connections (between the mid-pipe and the factory manifolds or downpipes).
  3. Attach the new mid-pipe(s) to the flanges. Torque bolts to manufacturer spec (typically 30-40 ft-lb).
  4. Slide the axle-back section onto the mid-pipe. Use the supplied clamps—do not tighten fully until alignment is correct.
  5. Adjust tips to sit evenly in the bumper cutouts. Leave about 1/4 inch clearance to avoid rattling.
  6. Tighten all clamps and hangers. Recheck after a short drive when the metal expands.

If your exhaust system replaces the catalytic converters (full turbo-back), be aware that removing cats is illegal on public roads in many regions. This guide assumes a cat-back upgrade only, which typically yields 15-20 hp on its own when paired with a tune.

Step 4: ECU Remapping and Tuning

With intake and exhaust physically installed, it’s time to optimize the ECU. The TRX’s factory calibration is conservative, especially in areas like ignition timing, fuel enrichment, and boost pressure. A custom tune can safely increase boost by 2-3 psi and adjust air/fuel ratio to maximize power without knocking.

Selecting a Tuning Method

  • Handheld Programmer (e.g., DiabloSport i3 or Trinity): Pre-loaded tunes are easy to install but are generic. For a dyno-verified 80 hp increase, you need a tune specifically developed for the TRX with intake and exhaust mods. Some companies offer data-logging and remote tuning sessions.
  • Custom Tuning via HP Tuners or SCT: Requires a laptop and software license. You can load a base tune from a reputable tuner (e.g., Hennassee, Livernois, or Palm Beach Dyno). Then data-log on the dyno to fine-tune. This method yields the most power and safety.

Installation Process

  1. Connect the tuning device to the OBD-II port under the dash.
  2. Read the current stock calibration. Save it as a backup (critical).
  3. Select the performance tune (e.g., “91 Octane – Intake/Exhaust” or “93 Octane Stage 2”).
  4. Follow the programmer’s prompts. The ECU will be written with the new calibration. Do not interrupt the process (battery disconnected).
  5. After programming, start the engine and let it idle for 2 minutes. Check for warning lights.
  6. Perform a short test drive allowing the ECU to adapt. Avoid hard acceleration until the tune is verified on the dyno.

Warning: Using a tune that requests more than 93 octane fuel without adding race gas can cause detonation. If your local fuel is only 91 octane, select a 91 octane tune. The additional 80 hp is predictable on 93 octane with proper modifications.

Step 5: Dyno Testing and Verification

Take the TRX to a professional dyno facility that has experience with AWD vehicles (the TRX is full-time all-wheel drive, so a 2WD dyno is not suitable). The dyno operator should strap down the vehicle and attach a wideband O2 sensor to the exhaust for accurate air/fuel measurement.

Running the Dyno Session

  • Perform at least three pulls in 4th gear (1:1 ratio) from about 2,000 rpm to redline (6,200 rpm).
  • Record peak horsepower, torque, boost pressure, and air/fuel ratio.
  • Expected results: With cold air intake, cat-back exhaust, and a quality tune, you should see 80–85 whp over stock. Factory TRX RWD dyno numbers are around 550-570 whp (corrected). After mods, expect 630-650 whp (approximately 780-800 crank hp).
  • If the gain is less than 70 whp, check for intake leaks, exhaust restrictions, or insufficient fueling. A tuner can adjust the tune on the dyno in real time.

Fine-Tuning Adjustments

The dyno operator will monitor knock sensors. If knock is detected, the tune’s ignition timing must be reduced. Conversely, if air/fuel ratio is too rich (below 11.5:1), the tune may be wasting power. A target of 11.8–12.2:1 under boost is typical for a supercharged engine. After adjustments, re-run to confirm the 80 hp increase is consistent.

Step 6: Final Checks and Post-Installation Procedures

After successful dyno verification, perform a thorough inspection:

  • Re-torque all exhaust bolts and clamps after heat cycling (cool down then retighten).
  • Check all intake coupling clamps for security.
  • Clear any diagnostic trouble codes (DTCs) that may have set during tuning (e.g., oxygen sensor readiness codes).
  • Inspect for fluid leaks (coolant, oil, fuel).
  • Update your insurance policy—a 780 hp truck may require an agreed value policy.

Maintenance Recommendations

With increased power, maintenance intervals shorten. Change engine oil every 3,000-4,000 miles using full synthetic 5W-30. Inspect spark plugs every 15,000 miles; consider upgrading to colder heat range plugs (e.g., NGK 6510) for track use. Clean the cold air intake filter every 10,000 miles or more frequently in dusty conditions. Monitor fuel quality—always use top-tier 93 octane. Consider adding a catch can to reduce oil vapor entering the intake, especially on a supercharged engine.

Common Pitfalls and Troubleshooting

Check Engine Light (CEL) After Tune

If the CEL illuminates, read the code. Common codes include P0171/P0174 (lean condition) due to a post-MAF intake leak, or P0420/P0430 (catalyst efficiency) if you removed cats. A tune should disable rear O2 sensors for catalyst monitoring. If not, have the tuner adjust.

Excessive Supercharger Noise

After a cold air intake, the supercharger whine will be louder. This is normal. However, if you hear a metallic screeching, it may indicate a loose pulley or belt issue. Inspect the serpentine belt tensioner.

No Power Gain on Dyno

If the dyno shows little improvement, ensure the tune was actually loaded (many handhelds require a separate “install” step). Verify the intake filter is not too restrictive and that the exhaust has no obstructions (e.g., stuck butterfly valves). Also ensure the transmission is not slipping—TRX transmissions are robust, but high torque can cause slipping if fluid is old.

External Resources and References

  • Livernois Motorsports provides custom tuning for the TRX. Check their documented 80+ hp gains: Livernois Motorsports
  • AFE Power cold air intake and exhaust systems: AFE Power
  • HPTuners offers professional tuning software for advanced users: HP Tuners
  • 2021+ Ram 1500 TRX – Forum Tech Section for real-world owner experiences: Ram TRX Forum

Conclusion

Installing a dyno-verified 80 hp increase on the Ram 1500 TRX is a rewarding project that transforms an already ferocious truck into a true high-performance machine. By following the steps outlined—cold air intake, high-flow exhaust, and a custom ECU tune—you can confidently achieve and verify the power gain. Remember to prioritize safety, use quality parts, and always test on a certified all-wheel-drive dyno. The result is a daily-drivable truck that dominates both off-road and on the street. Maintain the upgraded components diligently, and your TRX will deliver thrilling performance for years to come.