What is the best exhaust for Isuzu D-MAX?

A DPF-back exhaust is the best option for most Isuzu D-MAX owners because it improves airflow, enhances sound, and remains compatible with factory emissions systems. For higher performance, a 3.5 inch exhaust system offers better airflow and increased efficiency.

What is better for Isuzu D-MAX: a 3 inch or 3.5 inch exhaust?

A 3 inch exhaust is ideal for daily driving, fuel efficiency, and balanced performance. A 3.5 inch exhaust system is better for towing, modified vehicles, and improved airflow.

Does upgrading the Isuzu D-MAX exhaust increase power?

Yes, upgrading the exhaust improves airflow and reduces back pressure, which can increase power and throttle response. The gains are more noticeable when combined with ECU tuning.

Does a D-MAX exhaust upgrade improve fuel efficiency?

Yes, improved airflow reduces engine strain, which can lead to better fuel efficiency, especially during long-distance driving.

What is a DPF-back exhaust for Isuzu D-MAX?

A DPF-back exhaust replaces the piping after the Diesel Particulate Filter. It improves airflow and sound while maintaining compliance with emissions systems.

Is upgrading the Isuzu D-MAX exhaust safe for long-term use?

Yes, a properly installed exhaust system designed for the Isuzu D-MAX is safe for long-term use and can improve engine efficiency and performance.

Does exhaust size affect performance in Isuzu D-MAX?

Yes, larger exhaust systems like a 3.5 inch exhaust allow better airflow and reduced back pressure, which improves performance, especially in modified or tuned vehicles.

Will a bigger exhaust make the Isuzu D-MAX louder?

Yes, a larger exhaust system produces a deeper and more noticeable sound compared to the stock exhaust, especially with performance-focused setups.

Best Exhaust for GWM Cannon Ute – Upgrade Guide & Buyer's Comparison (2020–2025)

August 25, 2026

If you own a GWM Cannon Ute you already know it's a seriously capable machine. The 2.0L GW4D20M turbo diesel punches hard, tows well and handles the rough stuff without complaint. But if you've spent any time behind the wheel you've probably noticed one thing the factory exhaust is holding it back.

It's not a criticism of GWM it's just the reality of how manufacturers tune exhaust systems for emissions compliance and noise regulations. The result is a restrictive setup that leaves real power, torque and fuel efficiency on the table. The good news is that Outback exhausts system fixes all of that and then some.

At Outback Exhausts we've been building performance exhaust systems for Australian 4x4s for decades. We know the GWM Cannon inside and out and we've engineered our systems specifically for the way Australians actually use their Utes towing heavy loads, exploring remote tracks and covering serious kilometres on the highway.

This guide covers everything you need to know about choosing the best exhaust for your GWM Cannon Ute, including a full comparison of our available systems, what to expect from each one and answers to the questions we hear most often.

Why Upgrade Your GWM Cannon Exhaust?

The factory exhaust on the GWM Cannon NPW is designed to be quiet and compliant not to maximise performance. When you replace it with a free flowing aftermarket system the GW4D20M turbo diesel can breathe properly and the results are immediately noticeable:

More power and torque — Gains at the wheels with stronger mid range pull
Reduced turbo lag — the turbo spools faster when backpressure is removed
Lower exhaust gas temperatures (EGTs) — critical for engine longevity especially when towing
Better fuel economy — improvement under highway conditions
A proper exhaust note — a deep, purposeful diesel growl instead of the muffled factory tone

Whether you're towing a caravan across the Nullarbor, running a loaded tray on the job site or just want your Cannon to feel as capable as it looks an exhaust upgrade is one of the best value modifications you can make.

Our GWM Cannon Exhaust Systems

We currently offer a premium 3.5-inch DPF Back Exhaust System for the GWM Cannon NPW 2.0L GW4D20M Turbo Diesel (2020–2025) available in two configurations to suit different preferences for sound level and driving style.

Browse our full GWM Cannon Exhaust Collection or jump straight to the product below.

DPF Back Exhaust – GWM Cannon NPW 2.0L GW4D20M Turbo Diesel (2020–2025)

This is our flagship system for the Cannon a full 3.5-inch mandrel-bent DPF back exhaust precision engineered and manufactured right here in Australia. It's a direct bolt on replacement for the factory DPF back section, meaning no cutting, no fabrication and no guesswork. Just bolt it on and feel the difference.

Built from 409 Grade Stainless Steel and MIG welded for leak free durability this system is designed to handle everything the Australian outback can throw at it extreme heat, corrugated dirt roads, creek crossings and years of hard use. Every system is test fitted on an actual GWM Cannon before it leaves our workshop and it's backed by our comprehensive 5year warranty.

View Product – DPF Back Exhaust for GWM Cannon NPW

Available in two variants:

3.5 inch / Straight Pipe / No Muffler — Maximum flow, loud and aggressive note. Best for off-road builds and enthusiasts who want maximum performance and sound.
3.5 inch / Resonator / Small Muffler — Quieter than the straight pipe option while still delivering full performance gains. Ideal for daily drivers, highway touring and those who want performance without excessive cabin noise.

GWM Cannon Exhaust Comparison Table

Not sure which configuration is right for you? Here's a side by side breakdown to help you decide:

Exhaust System	Engine Fit	Pipe Size	Best For	Key Benefit	View Product
DPF Back – Straight Pipe / No Muffler	GWM Cannon NPW 2.0L GW4D20M Turbo Diesel (2020–2025)	3.5 inch (88.9mm)	Off-road builds, performance enthusiasts, maximum sound	Maximum exhaust flow, aggressive diesel note, lowest backpressure	View Product
DPF Back – Resonator / Small Muffler	GWM Cannon NPW 2.0L GW4D20M Turbo Diesel (2020–2025)	3.5 inch (88.9mm)	Daily drivers, highway touring, towing, balanced sound	Full performance gains with a quieter, more refined exhaust note	View Product

Both systems are manufactured from the same premium 409 stainless steel, use the same mandrel bent 3.5 inch piping and carry the same 5year warranty. The only difference is the sound profile. So it really comes down to how you use your Cannon and how much exhaust note you want to hear on the daily commute.

Browse the full GWM Cannon Exhaust Collection →

What Makes Outback Exhausts Different?

There's no shortage of exhaust options on the market and we know you have choices. Here's why GWM Cannon owners across Australia choose Outback Exhausts:

Australian engineered and manufactured — designed specifically for Australian conditions not adapted from overseas templates
Test-fitted on real vehicles — every system is physically fitted to an actual GWM Cannon before production so you get guaranteed alignment and fitment
Advanced mandrel bending — maintains consistent pipe diameter through every bend for maximum flow with zero restrictions
MIG welded joints — leak free and built to withstand extreme vibration, temperature cycling and the punishment of off road driving
5-year warranty — we stand behind our work full stop
Australian-based support — real people, real knowledge, real help when you need it

Frequently Asked Questions

Will this exhaust fit my GWM Cannon?

Yes our DPF back exhaust is specifically engineered for the GWM Cannon NPW with the 2.0L GW4D20M turbo diesel engine, covering models from September 2020 through to current 2025 production. It's a direct bolt on replacement for the factory DPF back section. Before ordering, confirm your engine code is GW4D20M you'll find it on the engine cover or compliance plate.

How much power will I gain?

Most GWM Cannon owners see considerable gains at the wheels with even more noticeable improvements in torque throughout the rev range. The biggest real world difference is in throttle response and reduced turbo lag the Cannon feels significantly more responsive especially when loaded or towing. The GW4D20M responds exceptionally well to reduced backpressure.

How loud is it compared to the factory exhaust?

Both options are noticeably deeper and more aggressive than the factory system. The straight pipe / no muffler variant is loud and purposeful great for off road use and enthusiasts who want maximum sound. The resonator / small muffler variant is significantly quieter with a satisfying diesel rumble that doesn't become fatiguing on long highway runs. Neither option is excessively loud inside the cabin at cruise speed.

Can I install it myself?

Yes, if you're a competent home mechanic with the right tools. The DPF back design means you're working from the DPF outlet rearward more accessible than a full turbo back system. Most experienced DIYers complete the job in 2–3 hours. All necessary gaskets and mounting hardware are included (DPF gasket excluded). If you're not comfortable working under your vehicle or dealing with potentially seized exhaust bolts professional installation is recommended.

Does it improve fuel economy?

Many owners report fuel economy improvements under highway driving conditions. By reducing backpressure the engine doesn't have to work as hard to push exhaust gases out which translates to more efficient combustion. Results vary depending on driving style, load and conditions.

What's the difference between DPF back and turbo back?

A DPF back system replaces the exhaust from the Diesel Particulate Filter to the rear of the vehicle. A turbo back system replaces everything from the turbocharger outlet including the DPF section. DPF back systems are the most popular choice for street registered vehicles as they retain the DPF for emissions compliance. Turbo back systems offer maximum performance but are generally suited to off-road or competition use.

Ready to Upgrade Your GWM Cannon?

If you're serious about getting more from your GWM Cannon Ute an Outback Exhausts DPF back system is one of the smartest upgrades you can make. More power, better torque, lower EGTs, improved fuel economy and a sound that actually matches the way the Cannon looks it's a genuine all round improvement.

Choose your configuration below and get it delivered Australia-wide:

Or browse the complete range: GWM Cannon 4x4 Exhaust Systems | Outback Exhausts

Questions? Our team knows these systems inside and out get in touch and we'll point you in the right direction.

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