How to Install Test Pipes on Your Infiniti G37

Upgrading to test pipes in your Infiniti G37 can result in improved performance and a louder, more aggressive exhaust note. But, like any modification, it’s essential to know the right steps to ensure a proper and efficient installation. This guide covers everything from the tools required to dealing with potential issues like the check engine light.

Tools and Parts You’ll Need Before Installation

Before starting the installation of your test pipes, ensure you have all the necessary tools and parts for the job.

Tools Required

To successfully complete the installation, you’ll need the following tools:

  • Socket set and ratchet (3/8" drive is typically enough)

  • Extension bars to reach bolts in tight spaces

  • Wrenches for extra leverage when needed

  • Penetrating oil (PB Blaster) to loosen stubborn bolts

  • Torque wrench for tightening bolts to the correct specs

Parts You Will Need

Along with the G37 test pipes themselves, here are the other parts you’ll need:

G37 test pipes
  • Test pipes: These are your primary upgrade for the exhaust system.

  • Oxygen sensor spacers or defoulers: To prevent triggering a check engine light.

  • Gaskets: New gaskets to ensure a leak-free fit.

  • Replacement hardware: Bolts, nuts, and washers, as the original ones may be worn out or rusty.

Preparing Your G37 for Installation

Preparation is key to avoiding mistakes and ensuring a smooth installation process.

  • Ensure Safety First: Start by making sure the engine is completely cool. Lift the car securely with a jack and place it on jack stands. This will give you enough space to work underneath safely.

  • Disconnect the Battery: To avoid any electrical accidents, disconnect the negative terminal of your car’s battery before starting work.

  • Remove Any Heat Shields or Panels: Depending on your G37 model, you may have heat shields or underbody panels that need to be removed to access the catalytic converters. Make sure to carefully remove them, as you’ll need them for reinstallation later.

Removing the Stock Catalytic Converters

This is one of the more technical parts of the installation. Removing the catalytic converters requires a bit of patience, especially if the bolts are rusted.

Unbolt the Catalytic Converters

First, locate the bolts securing the catalytic converters to the exhaust manifold. Use your socket wrench to carefully remove the bolts. If they’re rusted or stuck, apply some penetrating oil and let it sit for 10-15 minutes before attempting again.

Handling Stubborn Bolts

For especially tough bolts, you may need a breaker bar for added leverage. If needed, an impact wrench can help loosen rusted bolts quickly. Just be careful not to damage the surrounding components.

Oxygen Sensor Removal

Before fully removing the catalytic converters, disconnect the O2 sensors. Use a wrench to unscrew them, taking note of their orientation so you can reinstall them later or install spacers.

Installing the Test Pipes

Now that the catalytic converters are out of the way, you’re ready to install your test pipes.

Installing the Test Pipes

Align and Position the Test Pipes

Start by aligning the test pipes with the exhaust flanges and insert the new gaskets. Ensuring proper alignment is essential to avoid exhaust leaks.

Secure the Test Pipes

Use the replacement bolts, nuts, and washers to secure the test pipes in place. Tighten them securely but avoid over-tightening, as this could damage the threads or warp the metal.

Reinstall the O2 Sensors or Install Spacers

If you're reusing the O2 sensors, screw them back in. Otherwise, install the O2 sensor spacers (or defoulers) to prevent the check engine light from turning on. These spacers are designed to move the sensors away from the exhaust stream to fool the ECU into thinking the catalytic converters are still in place.

Dealing with O2 Sensors and Check Engine Lights

After installing test pipes, you may encounter a check engine light (CEL). Here’s why it happens and how to address it.

Why the CEL Appears

The absence of catalytic converters causes the O2 sensors to detect abnormal oxygen levels in the exhaust stream, triggering the CEL. This is a common issue when upgrading to test pipes.

Using O2 Sensor Spacers

Installing O2 sensor spacers is a popular solution. These spacers move the sensors farther away from the exhaust gases, reducing the chances of an incorrect reading and preventing the CEL from turning on.

ECU Tuning

If you want a more permanent fix, consider tuning or reflashing your ECU. This will adjust the vehicle's air-fuel ratios and disable the CEL permanently, optimizing the system for the new exhaust configuration.

Performance Gains and Exhaust Sound After Installation

After installing the test pipes, you’ll notice several changes in both performance and sound.

Performance Gains

Test pipes reduce exhaust backpressure, improving exhaust flow. This can result in an increase of anywhere between 5 to 15 whp (wheel horsepower), depending on the specific test pipes and other modifications. This boost translates into a more responsive throttle and increased overall performance.

Exhaust Sound

The sound of your car will change dramatically with the installation of test pipes. Without catalytic converters, the exhaust gases are expelled more freely, creating a louder and more aggressive exhaust note. Non-resonated test pipes will make the sound louder, especially at higher RPMs. If you prefer a quieter tone, resonated test pipes might be the better choice as they help reduce drone while still delivering an enhanced exhaust sound.

Street Legality and Emissions Considerations

It’s important to consider the legal implications of installing test pipes in your region.

Emissions Testing

Test pipes remove the catalytic converters, which are crucial for passing emissions tests in some states (like California). Removing them makes the vehicle non-compliant with emissions regulations, and you may not pass the required tests.

Legal Alternatives: High-Flow Catalytic Converters (HFCs)

If emissions compliance is a concern, consider installing high-flow catalytic converters (HFCs). While they don’t offer the same performance boost as test pipes, they improve exhaust flow without violating emissions laws, making them a legal alternative.

Maintenance Tips After Installing Test Pipes

Regular maintenance is essential to keep your exhaust system in top shape after installing test pipes.

Check for Exhaust Leaks

After the installation, be sure to inspect the exhaust system for any leaks around the test pipe connections. If any leaks are present, they can negatively impact performance. Make sure the bolts are tightened securely.

Retighten Bolts Periodically

Heat expansion and contraction can loosen bolts over time. It’s important to periodically check and retighten the bolts securing the test pipes to prevent any rattling or exhaust leaks.

Monitor the O2 Sensors

Keep an eye on the O2 sensors. If you’re using spacers, monitor for any issues, such as poor fuel efficiency or a returning CEL. Replacing faulty sensors can help maintain optimal performance.

Conclusion: Enhance Your G37 with Test Pipes for Better Performance and Sound

Installing test pipes on your Infiniti G37 is a great way to boost performance, enhance throttle response, and achieve a more aggressive exhaust tone. By following this step-by-step guide, you can successfully complete the installation yourself, saving time and money. Just make sure to use the proper tools, take safety precautions, and consider the legal implications of removing the catalytic converters in your area.

Whether you're looking to improve your car’s performance at the track or enjoy a more exhilarating driving experience, test pipes are a fantastic modification. Keep in mind that regular maintenance and monitoring will ensure your new setup continues to perform at its best. Don’t forget to check your local emissions laws to avoid any legal issues, and consider alternatives like high-flow catalytic converters if necessary.

Now that you’re equipped with the knowledge to install test pipes, it’s time to get your hands dirty and enjoy the improved driving dynamics that come with this modification. Happy driving!

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