Uncork Your Exhaust: The Ultimate Guide to Nissan 370Z High Flow Cats and Test Pipes

The Nissan 370Z is not just a car; it's an icon that has captured the hearts of JDM car enthusiasts across the globe. With its sleek curves, nimble handling, and a VQ37VHR engine that offers a potent 332 horsepower, this sports car is already a head-turner on and off the racetrack. 

But for those with a thirst for more, upgrading the exhaust system can be your ticket to next-level performance. If terms like High Flow Cats (HFCs) and Test Pipes are music to your ears, you're in the right place. These aren't just parts; they're a crucial part of your exhaust system, influencing everything from airflow to that growly note that makes people look twice as you zoom by. 

This article is a deep dive into all things exhaust-related for the Nissan 370Z. We're talking basics, product recommendations, how-tos, and even some pro tips to make sure you have all the tools you need to upgrade your Z34. So buckle up; we're about to jump into the world of Nissan 370Z HFCs and Test Pipes!

The Best Nissan 370Z High Flow Cats

ISR Performance High Flow Cats

ISR Performance High Flow Cats Nissan 370Z
ISR Performance High Flow Cats

If you're looking for an HFC that balances performance staying legal, the ISR Performance High Flow Cats are a solid pick. Made with a 300 cell spun metallic substrate, these HFCs provide a less restrictive airflow compared to stock cats while still keeping those emissions in check. They're fully TIG welded with mandrel bends for optimal flow. Plus, they're compatible with both factory and aftermarket exhausts built to OEM specs. You even get to keep your factory O2 sensor location, and did I mention the more aggressive exhaust tone? Yep, you get that too.

AAM Competition Resonated High Flow Cats

AAM Competition Resonated High Flow Cats Nissan 370Z
AAM Competition Resonated High Flow Cats

The AAM Competition Resonated HFCs are designed with a keen focus on maintaining a balance between performance and emissions. The metallic catalytic element in the AAM Competition high flow cats allows for better airflow than stock cats, and they offer a significant reduction in back pressure. If you're concerned about noise, these are the quietest option on our list, adding depth without too much volume. You can expect an extra 8 to 16 hp depending on your existing exhaust setup.

ARK High Flow Cats

ARK High Flow Cats Nissan 370Z
ARK High Flow Cats

ARK's R-Spec Hi-Flow Cats are engineered for those who want to push the envelope when it comes to both performance and sound. These are constructed from polished SUS304 stainless steel and come with two O2 bungs. The Helmholtz-style reservoir chamber tech helps in maintaining a smooth flow while cutting down on drone and rasp. The end result is a more powerful and smoother exhaust note without the annoy rasp some aftermarket 370Z exhaust systems are known for.

Invidia High Flow Cats

Invidia HFC Nissan 370Z
Invidia High Flow Cats

Invidia's High-Flow Catalytic Converters are a game-changer for your Nissan 370Z. With larger pipes and smoother bends, these high-flow cats boost both horsepower and torque while staying street-legal. They're crafted with laser-cut cast steel flanges for durability and leak-free performance. Installation is a snap, fully bolt-on with no mods needed, and they're compatible with your factory O2 sensors.

Kinetix Racing High Flow Cats

Kinetix Racing High Flow Cats Nissan 370Z
Kinetix Racing High Flow Cats

Kinetix Racing's High Flow Cats are designed to tackle the most significant choke point your Z34’s factory exhaust system. These are made from stainless steel and fully TIG welded with mandrel bends. They're compatible with any header and exhaust system, be it factory or aftermarket. The best part? You won't have to worry about that annoying "raspy exhaust note" between 3-4k rpm. Expect gains between 7-9 hp at the wheels on most aftermarket exhausts.

The Best Nissan 370Z Test Pipes

Motordyne ART Pipes

Motordyne ART Pipes Nissan 370Z
Motordyne ART Pipes

Motordyne's ART Pipes are more than just test pipes; they're a revolutionary approach to altering exhaust harmonics. The Advanced Resonance Tuning (ART) technology significantly reduces or eliminates rasp and drone while boosting performance. If you're looking for a smooth, deep, and quiet sound, these are the best test pipes to go for.

Kinetix Racing Resonated Test Pipes

Kinetix Racing Resonated Test Pipes Nissan 370Z
Kinetix Racing Resonated Test Pipes

Kinetix Racing Resonated Test Pipes offer both high flow with reduced noise. They come with a large resonator section, making them perfect for turbocharged 370Zs, with gains of up to 25-35 hp. The pipes are made from stainless steel and feature mandrel bends and 3/8-inch thick flanges. They're designed not to throw a check engine light, making them a hassle-free upgrade.

AAM Competition 2.5" Resonated Test Pipes

AAM Competition 2.5" Resonated Test Pipes Nissan 370Z
AAM Competition 2.5" Resonated Test Pipes

AAM Competition's Resonated Test Pipes focus on maximizing flow while minimizing drone and rasp. Made in the USA from T-304 16-gauge stainless steel, these pipes can add around 8+ RWHP to your Nissan 350Z and 370Z. They come with all necessary hardware for an easy, direct bolt-on installation with the AAM Competition test pipes.

Berk Technology Resonated Test Pipes

Berk Technology Resonated Test Pipes Nissan 370Z
Berk Technology Resonated Test Pipes

Unleash your Nissan 370Z's power with a set of Berk Technologies Resonated Test Pipes. Designed for 2007-up models, the Berk test pipes come with fully gusseted support brackets and leak-free graphite collector gaskets. Easy to install, they offer a noticeable bump in both horsepower and torque, making them an ideal upgrade for 370Z owners looking to take performance to the next level.

AMS Motorsports SEKUSHI Resonated Test Pipes

AMS Motorsports SEKUSHI Resonated Test Pipes Nissan 370Z
AMS Motorsports SEKUSHI Resonated Test Pipes

The AMS Motorsports SEKUSHI Resonated Test Pipes are designed for those who want it all: performance, sound, and aesthetics. These pipes offer up to a 15+ hp increase and come with features like additional wide sensor bungs and laser TIG welded construction. If you're looking for the ultimate upgrade, they even offer a Full Titanium Version for maximum weight reduction and sound perfection.

Why Replace The Stock 370Z Catalytic Converters?

Performance Improvements

Upgrading your exhaust system is one of the most effective ways to boost your car's performance. A good HFC or Test Pipe can significantly improve airflow, allowing your VQ37VHR engine to breathe better. This results in increased horsepower and torque, giving you that extra oomph when you hit the throttle.

Better Sounding Exhaust

Let's be honest, the sound of a roaring engine can be music to an enthusiast's ears. Upgrading your exhaust system can give your Nissan 370Z a deeper, more aggressive exhaust note. Plus, a shiny new exhaust setup can add a nice visual touch to your car, making it stand out even more.

High Flow Cats (HFCs) vs. Test Pipes: What's the Difference?

What Are Nissan 370Z HFCs?

High Flow Catalytic Converters (HFC’s) are designed to allow for better airflow compared to stock catalytic converters, while still reducing harmful emissions. They are generally considered a more 'street-legal' option for those who want to boost performance without running afoul of emissions regulations.

What Are Nissan 370Z Test Pipes?

Test Pipes, on the other hand, are straight pipes that replace the catalytic converter entirely. They offer the most unrestricted airflow, leading to maximum performance gains. However, they are generally not street-legal and are recommended for off-road or track use only.

Comparing the Two: Performance, legality, and emissions

When it comes to performance, Test Pipes usually have the upper hand because they provide the least restricted airflow. However, HFCs are the go-to option if you want a balance between performance and legality. HFCs are designed to meet emissions standards, making them a safer bet for street use. Test Pipes will give you the max performance boost, but keep in mind that they might get you in trouble with the law if used on public roads.

Installing Your New HFCs or Test Pipes

Tools Needed

You'll need a basic set of automotive tools, including a socket set, wrenches, screwdrivers, and possibly a rubber mallet. Don't forget safety gear like gloves and safety glasses. It's always good to have penetrating oil like WD-40 on hand to help loosen stubborn bolts.

Test For Leaks

Once everything is installed and tightened, start the engine and listen for any exhaust leaks. A leak will usually make a hissing or popping noise and should be addressed immediately to prevent performance loss.

The Importance of a Good Tune

After installing new HFCs or test pipes, a proper tune is crucial to ensure your VQ37 engine runs optimally with the new exhaust flow characteristics. This can often be done via an ECU reflash or using a piggyback tuning module.

How to Choose Between HFCs and Test Pipes

Nissan 370Z Remark Catback Exhaust

Potential Legal Issues

Always check your local and federal emissions regulations before making any modifications. HFCs are usually the safer bet for street-legal driving, while test pipes are often restricted to off-road or track use.

Your Budget

HFCs generally cost more due to the catalytic material but offer peace of mind with emissions. Test pipes are usually cheaper but may require additional tuning to prevent check engine lights, which could offset the initial savings.

OverRev’s Nissan 370Z HFC & Test Pipe Guide

Modified White Nissan 370Z
"370z 3" by Ali Al-Emadi is licensed under CC BY 2.0

 In this comprehensive guide, we've walked you through the ins and outs of exhaust systems, spotlighting the best HFCs and test pipes specifically designed for your Nissan 370Z. From installation pointers to maintenance hacks, we've aimed to equip you with the knowledge you need to boost your ride's performance safely and effectively.

When it comes to making your final choice, consider HFCs if you're seeking a harmonious blend of performance and legal compliance. But if you're all about pushing the envelope and maximizing raw power—and you can handle a bit more rumble in your exhaust note—then test pipes could be your ticket to automotive nirvana. Just remember to keep local laws in mind and think about getting a professional installation for the best outcome.

Thank you for reading our comprehensive Nissan 370Z HFC & Test Pipe guide! If we've revved up your enthusiasm for optimizing your Nissan 370Z, you're in for a treat. We've got a whole garage of information waiting for you, covering everything from Nissan 370Z Exhausts to Headers, Air Intakes, Turbo Kits, and even Superchargers Kits. So why stop here? Continue your journey in car tuning with us. We can't wait to have you back for more insights. Happy wrenching!

Frequently Asked Questions (FAQs)

Will upgrading to HFCs or Test Pipes affect my 370Z's fuel efficiency?

Upgrading to High Flow Cats (HFCs) or Test Pipes can impact your Nissan 370Z's fuel efficiency, though the effect is generally minimal. If fuel economy is a significant concern, it's best to consult with a professional before making any modifications.

Do I need to re-tune my 370Z after installing new HFCs or Test Pipes?

Yes, it's advisable to get a new tune after upgrading your exhaust components. This ensures that your Nissan 370Z's engine management system is calibrated to work with the new exhaust flow characteristics, optimizing performance and potentially improving fuel efficiency.

What are some common signs that it's time to replace the HFCs or Test Pipes on my 370Z?

Common indicators include a decline in performance, increased exhaust noise, or a check engine light. If you experience any of these issues, it's best to consult a professional for a proper diagnosis and recommendation.

Is this upgrade legal?

The legality of these upgrades varies by jurisdiction. HFCs are generally considered street-legal, while test pipes are usually for off-road or track use only.

What are the most trusted brands for HFCs and Test Pipes?

Brands like ISR Performance, AAM Competition, and ARK are highly reputable in the automotive aftermarket industry for HFCs and test pipes.

How long does installation typically take?

Installation time can vary but generally expect to spend anywhere from 1 to 3 hours, depending on your level of expertise and the complexity of your existing setup.

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