Installing a Sport Cat-Back Exhaust on the 2019 Acura RLX: Tools and Tips

Upgrading your 2019 Acura RLX with a sport cat-back exhaust system is one of the most effective ways to enhance both the vehicle's performance and sound profile. A sport cat-back exhaust replaces the factory exhaust piping from the catalytic converter back to the muffler and tailpipe, improving exhaust flow, reducing backpressure, and often adding a more aggressive and refined exhaust note. This modification not only can increase horsepower and torque but also gives your RLX a sportier character that stands out on the road.

Before diving into the installation process, it’s crucial to be well-prepared with the right tools, workspace setup, and understanding of the steps involved. This guide covers everything you need to know to install a sport cat-back exhaust on your 2019 Acura RLX safely and efficiently.

Why Choose a Sport Cat-Back Exhaust?

The factory exhaust system on the Acura RLX is designed primarily for smoothness, emissions control, and quiet operation, which can sometimes limit peak performance and the exhaust sound. By switching to a sport cat-back system, you get several benefits:

  • Improved Exhaust Flow: Larger diameter piping and mandrel bends reduce restrictions, allowing exhaust gases to exit more freely.
  • Performance Gains: Better flow can translate to increased horsepower and torque, especially when combined with other performance modifications.
  • Enhanced Sound: A sport cat-back exhaust typically offers a deeper, more aggressive exhaust note that enhances driving enjoyment without being excessively loud.
  • Weight Reduction: Many aftermarket exhausts use lighter materials like stainless steel or titanium, reducing overall vehicle weight.
  • Aesthetic Appeal: Upgraded exhaust tips and polished finishes can improve the rear-end appearance of your RLX.

Preparing for the Installation

Workspace and Safety Precautions

Before starting the installation, select a level, well-lit workspace with adequate room to maneuver under your Acura RLX. A garage or driveway with solid ground is ideal. Safety is paramount, so always use the following precautions:

  • Ensure the vehicle is completely cooled down: Exhaust components can become extremely hot during operation. Allow the car to sit for several hours to avoid burns.
  • Wear protective gear: Use safety glasses to protect your eyes from debris, gloves to safeguard your hands, and closed-toe shoes.
  • Secure the vehicle: Use jack stands or automotive ramps—never rely solely on a car jack—to elevate the RLX safely and prevent accidents.

Gathering the Necessary Tools

Having the right tools on hand will make the installation process smoother and prevent frustration. Here’s a detailed list of tools and supplies you’ll need:

  • Socket Wrench Set: A comprehensive set with metric sizes and extensions to reach bolts in tight spots.
  • Penetrating Oil: Essential for loosening rusted or seized bolts, especially on older vehicles or if the stock system has been on for a while.
  • Jack Stands or Ramps: To safely elevate and stabilize the vehicle during the work.
  • Rubber Mallet or Hammer: Helps to gently tap exhaust components loose without damaging them.
  • Torque Wrench: Ensures bolts are tightened to the manufacturer’s specifications, preventing leaks or damage.
  • Exhaust Hanger Removal Tool (optional): Makes removing rubber hangers easier and reduces risk of tearing.
  • Anti-Seize Compound: Useful to apply on bolts during reassembly to prevent future rusting and ease future removals.
  • Replacement Gaskets and Clamps: Some exhaust kits include these, but having spares available ensures a proper seal.

Step-by-Step Installation Guide

1. Prepare the Vehicle

Park your Acura RLX on a flat surface and engage the parking brake. After ensuring the vehicle is completely cooled, raise it using ramps or a jack and secure it on jack stands. Double-check the vehicle’s stability before crawling underneath.

2. Apply Penetrating Oil to Bolts and Hangers

Spray penetrating oil liberally on all bolts, nuts, and exhaust hangers that attach the stock exhaust system to the chassis. Let it soak for 10 to 15 minutes. This will help loosen rust and corrosion, making the removal process easier and reducing the chance of stripping bolts.

3. Remove the Stock Exhaust System

Starting at the rear, carefully unbolt the exhaust clamps connecting the stock cat-back system to the catalytic converter. It’s helpful to have a friend assist in supporting the exhaust as you remove bolts to prevent damage or injury.

Next, remove the rubber exhaust hangers that hold the exhaust in place. Use an exhaust hanger removal tool or a pry bar to gently slide the hangers off the mounting points. Be cautious to avoid tearing the rubber or bending the hangers excessively.

Once all bolts and hangers are free, carefully lower the stock exhaust system and set it aside. Inspect the catalytic converter flange and exhaust manifold for any damage or leaks.

4. Prepare the New Sport Cat-Back Exhaust

Lay out all components of your new sport cat-back exhaust system on a clean surface. Compare each piece with the stock system to familiarize yourself with the differences. Check that all gaskets, clamps, and hardware are included.

If your new exhaust system includes multiple sections, loosely assemble them on the ground to confirm fitment and orientation before installing on the vehicle.

5. Install the New Exhaust System

Begin installation by loosely attaching the front section of the cat-back exhaust to the catalytic converter flange using new gaskets and supplied clamps or bolts. Do not fully tighten at this stage to allow for adjustment.

Next, work your way back, connecting each section of the exhaust and securing with clamps or bolts. Use the rubber hangers to suspend the exhaust system in its mounting points. It’s important to leave some play for final alignment.

Once all components are in place and the exhaust is properly aligned with adequate clearance from the underbody and suspension parts, tighten all bolts and clamps to the manufacturer’s recommended torque specifications using a torque wrench. Over-tightening can damage flanges or strip threads, while under-tightening can cause leaks.

6. Double-Check for Proper Fitment and Leaks

Visually inspect the entire exhaust system to ensure there is no contact with heat shields, body panels, or suspension components that could cause noise or damage. The exhaust tips should be centered and aligned with the rear bumper cutouts.

Start the engine and listen carefully for any exhaust leaks, rattles, or abnormal noises. If you detect leaks, re-tighten clamps or bolts as needed. Also, check that the exhaust system does not vibrate excessively during engine idle or acceleration.

Additional Tips for a Successful Installation

Consider Professional Assistance

If you encounter stubborn rusted bolts, complex hangers, or tight spaces, consulting a professional mechanic or exhaust specialist can save time and prevent damage. Many exhaust shops offer installation services if you prefer expert help.

Complementary Upgrades

To maximize the benefits of a sport cat-back exhaust, consider pairing the upgrade with other performance enhancements such as:

  • High-flow catalytic converters: Improve exhaust gas flow further, enhancing power gains.
  • Cold air intake systems: Increase engine breathing and performance synergy.
  • Performance tuning: ECU remapping or piggyback tuners can optimize engine parameters to fully exploit exhaust upgrades.

Before installing an aftermarket exhaust, verify its compliance with local emissions and noise regulations. Some sport exhaust systems may not be street-legal in all areas. Additionally, modifications can affect your vehicle’s warranty, so review Acura’s policies or consult your dealer.

Maintenance and Longevity of Your Sport Cat-Back Exhaust

To keep your new exhaust system in peak condition, follow these maintenance tips:

  • Regular Inspections: Periodically check for loose bolts, corrosion, or damage, especially after winter or exposure to road salts.
  • Clean the Exhaust Tips: Use metal polish and a soft cloth to maintain a shiny appearance and prevent buildup.
  • Address Leaks Promptly: Early detection and repair of leaks prevent damage to other components and maintain performance.
  • Avoid Short Trips: Frequent short trips can cause condensation buildup, leading to rust. Longer drives help evaporate moisture.

Conclusion

Installing a sport cat-back exhaust on your 2019 Acura RLX is a rewarding upgrade that enhances driving enjoyment through improved performance and a more aggressive exhaust sound. By preparing your workspace, gathering the right tools, and following the detailed installation steps outlined above, you can complete the job safely and efficiently. Remember to consider additional performance upgrades and stay mindful of legal requirements to make the most of your modified RLX. With proper care and maintenance, your sport cat-back exhaust will provide years of enhanced driving pleasure.