AEM Wrangler Exhaust Installation: Complete Guide for Beginners

Upgrading your Jeep Wrangler with an AEM exhaust system is one of the most effective ways to improve engine performance, exhaust flow, and sound quality. This guide walks you through the entire installation process with clear steps, safety tips, and professional insight—even if you’ve never worked on an exhaust before. By the end, you’ll have the confidence to complete the job in your own garage.

Why Choose an AEM Exhaust for Your Wrangler

AEM exhaust systems are engineered for maximum flow and durability. They are built from corrosion-resistant materials like stainless steel and aluminized steel, and they often feature mandrel-bent tubing to reduce restrictions. Benefits include:

  • Increased horsepower and torque – improved exhaust scavenging helps the engine breathe better.
  • Deep, aggressive sound – without being obnoxious at highway speeds.
  • Weight savings – lighter than the factory system.
  • Bolt-on installation – designed to fit OEM hangers and mounting points.

For more details on the technology, visit the AEM official website.

Tools and Materials Needed

Gathering everything beforehand prevents frustration. Here’s a complete list:

  • AEM Wrangler exhaust kit (check part number for your model year)
  • Socket set – metric and standard (typically 10mm, 13mm, 15mm, 18mm)
  • Wrench set – combination wrenches in the same sizes
  • Screwdriver set – flathead and Phillips
  • Jack and jack stands (or a lift)
  • Safety goggles and gloves
  • Penetrating oil (like PB Blaster or WD-40 Specialist)
  • Torque wrench – for proper fastener tightening
  • Rubber mallet – to tap stubborn hangers
  • Exhaust hanger removal tool (optional but helpful)
  • Anti-seize compound – for future removal

If you don’t have a torque wrench, consider borrowing or buying one – over-tightening can damage flanges or strip bolts.

Preparation Steps

Safety First

  • Park on a flat, solid surface.
  • Engage the parking brake and chock the front tires.
  • Allow the exhaust system to cool completely (at least one hour after driving).
  • Disconnect the negative battery terminal to avoid accidental shorts when working near sensors.

Loosen Rusted Bolts

Apply penetrating oil to all exhaust flange bolts, hanger bolts, and the O2 sensor (if removal is required). Let it soak for 10–15 minutes. This step is especially important if you live in a salt-belt region where corrosion is common.

Understand Your Kit

Open the AEM exhaust box and lay out all components. Compare them with the instruction sheet. Typical pieces include the intermediate pipe, muffler assembly, tailpipe, clamps, bolts, washers, and rubber hangers. Confirm you have the correct hardware before starting.

Removing the Old Exhaust System

Take your time here – rushing can lead to broken bolts or damaged hangers.

  1. Lift the vehicle. Use a jack to raise the rear of the Wrangler at the designated lift points, then place jack stands under the frame rails behind the rear wheels. Lower the jack so the weight rests on the stands. Do not rely on the jack alone.
  2. Remove exhaust hangers. Using a wrench or screwdriver, carefully pry the rubber hanger isolators off the metal studs on the exhaust. A bit of soapy water or silicone spray helps them slide off. Some Wranglers have three or four hangers.
  3. Unbolt the flanges. Starting at the catalytic converter flange, remove the bolts. If they are rusted, apply more penetrating oil and use a breaker bar. Avoid rounding the bolt heads by using six-point sockets.
  4. Disconnect any O2 sensors. On some models, you may need to unplug the wiring harness before dropping the exhaust. Use an O2 sensor socket if necessary. Be gentle with the wires.
  5. Lower the old exhaust. With all connections free, slide the system out from under the vehicle. You may need a helper to avoid scratching the paint or damaging the rear differential. Dispose of the old parts responsibly.

Note: If a bolt breaks or a stud snaps, you can drill it out or use a bolt extractor. This is rare when proper penetrating oil and patience are used.

Installing the AEM Wrangler Exhaust

Dry Fit the Components

Before tightening anything, loosely connect all sections of the AEM exhaust. Place the intermediate pipe at the catalytic converter flange, attach the muffler section, and then the tailpipe. Make sure the exhaust tips are centered in the rear bumper cutouts. Adjust the position so there are no contact points with the frame, spare tire bracket, or suspension components.

Secure the Connections

  • Apply a light coat of anti-seize to the flange bolts and threads. This prevents seizing and makes future removal easier.
  • Use the supplied gaskets or seals. If your kit uses a donut gasket, ensure it is seated properly.
  • Tighten flange bolts to the manufacturer’s recommended torque (typically 30–35 ft-lb for M10 bolts). Refer to the AEM installation documents for specific specs.
  • Attach the exhaust hangers. Most AEM kits include new isolators that fit over the chassis studs. Push them firmly into place. A flathead screwdriver can help seat them.
  • Reattach any O2 sensors to the new exhaust (if your kit includes bungs). Apply anti-seize to the sensor threads but avoid getting it on the sensor tip.

Final Positioning and Tightening

Once all components are loosely assembled, go back and tighten each clamp and bolt systematically. Use a torque wrench for consistency. Pay special attention to the tailpipe clamp – overtightening can crush the pipe. Then reinstall any heat shields if they were removed.

Lower the vehicle off the jack stands. Before fully committing, start the engine and listen for leaks or rattles.

Final Checks and Testing

  1. Inspect all connections – look for exhaust gasses escaping at flanges or clamps. Use your hand (near but not touching) to feel for puffs of air.
  2. Listen for abnormal noises – a ticking sound may indicate a small leak; a drone at certain RPMs could mean the exhaust is contacting the chassis.
  3. Check clearance – turn the steering fully left and right to ensure the exhaust doesn’t hit the sway bar or steering linkage. On lifted Wranglers, this is especially important.
  4. Monitor for error codes – if you disconnected O2 sensors, the check engine light may come on. Drive the vehicle for a few miles to see if it clears. If it stays, use an OBD-II scanner to diagnose.
  5. Re-torque after heat cycle – after the system gets hot and cools down (say, after a 20-minute drive), recheck all fasteners. Expansion and contraction can loosen them slightly.

Performance Gains and Sound Profile

After a successful installation, you’ll notice an immediate difference:

  • Throttle response – the engine revs more freely due to reduced backpressure.
  • Sound – expect a mellow rumble at idle that builds to a purposeful roar under acceleration. AEM systems are tuned to minimize drone inside the cabin.
  • Power increase – typical gains range from 5–15 horsepower and 8–12 ft-lb of torque at the wheels, depending on your engine (3.6L Pentastar, 2.0T, etc.).

For dyno charts and specific vehicle data, check AEM’s product pages.

Maintenance Tips for Your AEM Exhaust

Regular Inspections

  • Every oil change, look under the car for rust, dents, or loose hangers.
  • Check the exhaust tips for carbon buildup. Clean them with soapy water and a soft cloth to prevent pitting.
  • Listen for changes in sound – a sudden increase in noise could mean a leak or broken weld.

Winter and Off-Road Care

  • If you drive on salted roads, rinse the underside periodically. Stainless steel resists corrosion, but salt can still cause surface rust.
  • After mudding, spray out the exhaust tip and around the muffler to prevent caked dirt that holds moisture.

Hardware Maintenance

  • Every year, apply a drop of penetrating oil to the hanger studs and flange bolts to keep them free.
  • If you notice a clamp loosening, re-tighten it to spec.

For cleaning tips and recommended products, visit AEM’s maintenance guide (example link).

Common Questions and Troubleshooting

“The exhaust tip sticks out too far.”

Adjust the tailpipe section before final tightening. Most AEM kits allow 1–2 inches of fore-aft movement. Loosen the clamp, slide the tip inward, and retighten.

“There’s a rattle when I go over bumps.”

Check for contact between the exhaust and the spare tire carrier, rear stabilizer bar, or shock mounts. You may need to slightly bend a hanger or use a rubber isolator that provides more clearance.

“Do I need a tune after installing an AEM exhaust?”

On modern Wranglers (2012+), the engine’s ECU automatically adjusts fuel trims within a reasonable range. A tune is not required but can optimize the gains. For turbo models, a tune is more beneficial.

“Can I install this if my Wrangler is lifted?”

Yes. Most AEM exhausts are designed to work with up to 3–4 inches of lift. On higher lifts, you may need an extension for the tailpipe or a relocation bracket for the O2 sensor.

For detailed fitment questions, refer to the AEM FAQ page.

Final Thoughts

Installing an AEM Wrangler exhaust is a satisfying project that delivers immediate audible and performance rewards. By following this guide, you’ve learned not just how to bolt on a new system, but how to do it safely, correctly, and with confidence. Whether you’re a first-timer or a seasoned DIYer, a properly installed AEM exhaust will transform your driving experience for years to come.

Remember to always double-check your work, follow torque specifications, and break in the system gradually. Enjoy the sound of the trail – open road awaits!