Installing Test Pipes: A Step-by-Step Guide

If you’re looking to increase the performance of your car, installing test pipes is a popular and effective option. Test pipes, also known as test pipes, are aftermarket exhaust components that replace the restrictive catalytic converters in your car’s exhaust system. This allows for better airflow and increased horsepower and torque.

In this step-by-step guide, we’ll walk you through the process of installing test pipes on your car, specifically the Infiniti G37, Q50, and Nissan 370z and 350z models. We’ll also cover some important information about test pipes and their benefits.

What Are Test Pipes and Why Should You Install Them?

Test pipes are aftermarket exhaust components that replace the restrictive catalytic converters in your car’s exhaust system. They are designed to increase airflow and improve the performance of your car’s engine.

By removing the catalytic converters, test pipes allow for a more direct flow of exhaust gases, resulting in increased horsepower and torque. They also produce a louder and more aggressive exhaust sound, which is a desirable feature for many car enthusiasts.

Benefits of Installing Test Pipes

  • Increased horsepower and torque
  • Improved engine performance
  • Louder and more aggressive exhaust sound
  • More affordable than other exhaust upgrades
  • Easy to install with basic tools

Step-by-Step Guide to Installing Test Pipes

Step 1: Gather Your Tools and Materials

Before you begin the installation process, make sure you have all the necessary tools and materials. Here’s a list of what you’ll need:

  • Test pipes (specific to your car model)
  • Jack and jack stands
  • Socket wrench set
  • Torque wrench
  • Penetrating oil
  • Anti-seize lubricant
  • Gasket sealant
  • Safety glasses
  • Gloves

Step 2: Prepare Your Car

Car on jack stands

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To access the exhaust system, you’ll need to raise your car using a jack and jack stands. Make sure to follow proper safety precautions and secure the car before getting underneath it.

Step 3: Remove the Old Exhaust Components

Using a socket wrench, remove the bolts that connect the exhaust pipes to the catalytic converters. You may need to use penetrating oil to loosen any stubborn bolts. Once the bolts are removed, carefully remove the old exhaust components.

Step 4: Install the Test Pipes

Test pipes

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Place the test pipes in the same location where the catalytic converters were removed. Make sure they are properly aligned and secure them using the bolts provided with the test pipes. Use a torque wrench to tighten the bolts to the manufacturer’s specifications.

Step 5: Reconnect the Exhaust System

Using a socket wrench, reconnect the exhaust pipes to the test pipes. Make sure all connections are secure and tight.

Step 6: Apply Gasket Sealant

To prevent any leaks, apply a thin layer of gasket sealant to the connections between the exhaust pipes and the test pipes.

Step 7: Lower Your Car and Test the Exhaust System

Car on the road

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Once the test pipes are installed, lower your car and start the engine. Take your car for a test drive to ensure everything is working properly and there are no leaks or unusual sounds.

Tips for Installing Test Pipes

  • Make sure to purchase test pipes that are specifically designed for your car model.
  • Wear safety glasses and gloves to protect yourself during the installation process.
  • Use anti-seize lubricant on the bolts to prevent them from seizing in the future.
  • Apply gasket sealant to prevent any leaks.
  • Follow the manufacturer’s torque specifications when tightening the bolts.
  • If you’re not comfortable with the installation process, it’s best to seek professional help.

Test Pipes vs. High-Flow Catalytic Converters

While test pipes and high-flow catalytic converters both improve the performance of your car’s exhaust system, there are some key differences between the two.

Test pipes are more affordable and easier to install compared to high-flow catalytic converters. However, high-flow catalytic converters are legal in all 50 states, while test pipes are not. It’s important to check your state’s emissions laws before installing test pipes.

Real-World Example: Installing Test Pipes on a G35 Coupe

G35 Coupe

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To give you a better understanding of the installation process, let’s take a look at a real-world example of installing test pipes on a G35 Coupe.

The owner of the car, John, purchased ISR resonated test pipes and followed the steps outlined in this guide. After the installation, he noticed a significant increase in horsepower and torque, as well as a more aggressive exhaust sound.

John also mentioned that the installation process was relatively easy and only took him a few hours to complete. He recommends using anti-seize lubricant and gasket sealant to prevent any future issues.

Pipe Inspection: A Crucial Step in the Installation Process

Before installing test pipes, it’s important to inspect your car’s exhaust system for any damage or leaks. This will ensure that the test pipes are installed correctly and will function properly.

If you notice any damage or leaks, it’s best to address them before installing the test pipes. This will prevent any issues in the future and ensure the best performance from your car’s exhaust system.


Installing test pipes is a popular and effective way to increase the performance of your car’s exhaust system. With the right tools and materials, you can easily install test pipes on your car and enjoy the benefits of increased horsepower and torque, improved engine performance, and a more aggressive exhaust sound.

Remember to always follow proper safety precautions and consult a professional if you’re not comfortable with the installation process. With this step-by-step guide, you’ll be on your way to a more powerful and exciting driving experience.

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