FULL 3" Downpipe & Exhaust System Install // 9th-Gen Civic FBO Part 1 of 4

Introduction

This tutorial provides a comprehensive guide to installing a 3" downpipe and exhaust system on a 9th-Gen Honda Civic. Following the systematic approach of the MiMast Method, this step-by-step guide will help you enhance your vehicle's performance by improving airflow.

Step 1: Prepare Your Workspace

• Gather all required tools and parts:
  • Low Profile Jack
  • Aluminum Jack Stands
  • Induction Torch
  • O2 Sensor Socket
  • Nickel Anti-seize
  • Silicone Spray Lubricant
  • Exhaust Hanger Pliers
• Ensure your workspace is clean and organized to facilitate a smooth installation process.

Step 2: Safely Lift Your Car

• Use the low-profile jack to lift the rear of your Civic.
• Secure the vehicle on aluminum jack stands to ensure stability during the installation.

Step 3: Remove the Windshield Cowl

• Carefully detach the windshield cowl at the front of the car to gain access to necessary components.

Step 4: Remove the Full Exhaust System

• Start with the rear section and use exhaust hanger pliers to remove the hangers.
• Gradually work your way forward, detaching the exhaust from the catalytic converter to the downpipe.

Step 5: Remove the Lower Torque Mount

• Locate the lower torque mount and remove it to facilitate the installation of the new downpipe.

Step 6: Install Upgraded Exhaust Bushings

• Replace the existing exhaust bushings with upgraded ones to improve durability and reduce vibrations.

Step 7: Assemble the KTuned Downpipe

• Follow the assembly instructions for the KTuned downpipe. Ensure all components fit snugly.
• Use nickel anti-seize on the threads of bolts to prevent seizing.

Step 8: Install the Upgraded Lower Torque Mount

• Securely attach the upgraded lower torque mount to the vehicle.
• Tighten the bolts to the specified torque:
  • Lower Torque Mount to Oil Pan Bracket - 54 ft-lbs
  • Lower Torque Mount to Front Subframe - 67 ft-lbs

Step 9: Install the Aftermarket Cat-back Exhaust

• Position the Yonaka 3” Cat-back Exhaust in place.
• Ensure all exhaust connections are tight and properly aligned.
• Torque the O2 sensors as follows:
  • Primary O2 Sensor - 32 ft-lbs
  • Secondary O2 Sensor - 32 ft-lbs

Step 10: Final Checks and Sound Clips

• Double-check all connections and torque specifications.
• Start the engine and listen for any unusual noises or vibrations.
• Capture sound clips to compare the new exhaust sound with the previous setup.

Conclusion

By following these steps, you have successfully installed a 3" downpipe and exhaust system on your 9th-Gen Honda Civic. This upgrade not only enhances performance but also improves the sound of your vehicle. For further modifications, consider upgrading the intake system or tuning your engine to maximize efficiency and performance. Happy modding!