Best Exhaust for Mazda BT-50 — The Complete Guide

If you own a Mazda BT-50 and you're chasing more grunt, a better exhaust note or just want to free up some of that restricted factory flow you're in the right place. Whether you're running the older 3.0L WEAT, the popular 3.2L P5AT or the newer 3.0L 4JJ3 there's a purpose built exhaust system from Outback Exhausts that's been designed specifically for your engine not adapted from something else.

All our BT-50 exhaust systems are manufactured from premium 409 stainless steel in our Narangba, Queensland facility. Each system is developed on real BT-50 vehicles by our in-house design team, using the original factory mounting points to guarantee accurate fitment, long-term durability and a hassle-free installation.

Why Upgrade Your Mazda BT-50 Exhaust?

The factory exhaust on the BT-50 is designed around noise, emissions and cost not performance. It's restrictive by nature. When you swap it out for a mandrel bent,  larger diameter stainless system you're giving the engine room to breathe. The results are real: better throttle response, improved torque delivery (especially in the mid-range where you need it most when towing or loaded up) and a sound that actually matches the capability of the truck.

Beyond performance, a quality stainless exhaust simply lasts longer. The factory mild steel systems corrode especially if you're doing beach runs or river crossings. Our 409 stainless steel systems are built to outlast the vehicle.

Our Mazda BT-50 Exhaust Systems

We carry exhaust systems across all major BT-50 engine variants. Here's a breakdown of what we offer and what each system is best suited for. You can also browse the full Mazda BT-50 Exhaust Systems collection.

1. Turbo Back Exhaust — Mazda BT-50 B3000 3.0L WEAT (2007–2011)

The 3.0L WEAT was the workhorse of the first gen BT-50 and it responds well to a proper exhaust upgrade. Our 3inch turbo back system is mandrel bent from 409 stainless and available in three configurations with high flow CAT and resonator for a medium note, straight-pipe for a louder setup or without CAT for those running off-road.

View the BT-50 3.0L WEAT Turbo Back Exhaust →

2. Turbo Back Exhaust — Mazda BT-50 3.2L P5AT (2011–2016)

The 5 cylinder P5AT is one of the most popular BT-50 engines on the road and our 3inch turbo back system is one of our best sellers for good reason. It's a direct fit system with multiple sound options medium note with resonator, loud with straight pipe or no CAT for off-road use.

View the BT-50 3.2L P5AT Turbo Back Exhaust (2011–2016) →

3. Turbo Back Exhaust — Mazda BT-50 3.2L P5AT (2016–2020)

The updated P5AT in the facelift BT-50 gets its own dedicated system. Available in 3inch with high flow CAT options and multiple sound configurations. This is the system for the serious tourer who wants factory quiet on the highway but knows the engine has more to give. 

View the BT-50 3.2L P5AT Turbo Back Exhaust (2016–2020) →

4. DPF Back Exhaust — Mazda BT-50 3.2L P5AT (2016–2022)

If you want to keep your DPF intact whether for compliance, warranty or daily driving the DPF back is the smart move. Available in 3inch or 3.5inch with resonator or straight pipe options. The 3.5inch gunmetal system is a popular choice for those wanting maximum flow without touching the DPF.

View the BT-50 3.2L P5AT DPF Back Exhaust →

5. Turbo Back Exhaust — Mazda BT-50 3.0L 4JJ3 (2020–On)

The newest BT-50 platform runs the Isuzu-sourced 4JJ3 engine and we've built a 3.5-inch gunmetal system specifically for it. Available in resonator or straight pipe configuration. If you've just picked up a new BT-50 and want to wake it up this is where to start. (off-road/exempt use only see disclaimer below.)

View the BT-50 3.0L 4JJ3 Turbo Back Exhaust →

6. DPF Replacement — Mazda BT-50 2.2L & 3.2L (2016–2020)

If your DPF is blocked, cracked or just done we carry a premium replacement DPF for the 2016–2020 BT-50. It's a direct fit unit built to OEM spec no cutting corners on emissions compliance.

View the BT-50 DPF Replacement →

7. Dump Pipe — Mazda BT-50 3.0L WEAT (2007–2011)

Running a custom setup or just need to replace the dump pipe on your early BT-50? We carry a dedicated dump pipe for the 3.0L WEAT. (off-road/exempt use only see disclaimer below.)

View the BT-50 3.0L WEAT Dump Pipe →

Comparative Analysis — Mazda BT-50 Exhaust Systems

Exhaust System	Engine Fit	Pipe Size	Best For	Key Benefit	View Product
Turbo Back	3.0L WEAT (2007–2011)	3 inch	Off-road & touring builds on early BT-50	Full system flow from turbo outlet; multiple CAT/muffler configs	View →
Turbo Back	3.2L P5AT (2011–2016)	3 inch	Daily driver & weekend tourer	Best-value full turbo-back for the 5-cyl P5AT; direct fit	View →
Turbo Back	3.2L P5AT (2016–2020)	3 inch	Towing & highway touring	Factory-quiet option available; high-flow CAT for ADR compliance	View →
DPF Back	3.2L P5AT (2016–2022)	3 inch or 3.5 inch	Daily driving; DPF retention for compliance	Keeps DPF intact; 3.5" option for maximum post-DPF flow	View →
Turbo Back	3.0L 4JJ3 (2020–On)	3.5 inch	New-gen BT-50 performance upgrade	Largest pipe size in the range; gunmetal finish; resonator or straight-pipe	View →
DPF Replacement	2.2L & 3.2L (2016–2020)	N/A	Blocked or failed DPF replacement	OEM-spec direct fit; maintains emissions compliance	View →
Dump Pipe	3.0L WEAT (2007–2011)	3 inch	Custom builds or dump pipe replacement	Dedicated fitment for early WEAT; pairs with turbo-back system	View →

Turbo Back vs DPF Back — Which One Do You Need?

This is the question we get asked most often and the honest answer is: it depends on how you use the truck and what you're comfortable with legally.

A turbo-back system replaces everything from the turbo outlet back including the DPF (diesel particulate filter) on newer models. It gives you the maximum flow improvement and the biggest performance gain. Please note turbo back systems are for off-road/exempt use only see disclaimer below.

A DPF-back system starts from behind the DPF and replaces the mid-pipe and muffler section. You keep your DPF , still get a meaningful improvement in flow and sound over the factory system. For most daily drivers and tourers this is the right call.

If you're unsure which system suits your setup browse the full BT-50 range or get in touch we're happy to talk through your specific build.

What Makes Outback Exhausts Different?

There's no shortage of exhaust options online but most of what you'll find is imported, generic or adapted from a similar vehicle. Here's what sets our systems apart:

• Australian-made: Every system is manufactured in Australia not imported and relabelled.
• 409 stainless steel: Corrosion-resistant and built for the long haul beach runs, river crossings and red dirt roads included.
• Mandrel-bent tubing: No crush bends. Smooth, consistent flow through every curve in the system.
• Direct fit: Engineered specifically for each BT-50 engine variant not a universal system with adapters.
• Multiple configurations: Choose your sound level and CAT setup to match your use case.

Frequently Asked Questions

Do I need a tune after fitting a new exhaust?

For most BT-50 owners a tune isn't strictly required after a DPF-back exhaust the ECU will adapt. However, if you're running a turbo-back system or combining the exhaust with other mods (intake, intercooler) a diesel tune will help you get the most out of the setup.

How long does installation take?

A straightforward DPF-back or turbo-back installation typically takes 1 to 2 hours at a workshop. All our systems come with the hardware needed for a direct bolt-on fit.

Can I fit an Outback Exhausts system myself?

Our systems are designed as direct bolt-on replacements. If you're mechanically confident and have access to a hoist or jack stands fitting is straightforward. That said we always recommend having exhaust work done by a qualified mechanic to ensure correct fitment and avoid exhaust leaks.

Do you ship Australia-wide?

Yes we ship to all states and territories. Most metro areas receive their order within 2–5 business days. We also ship internationally if you're ordering from overseas get in touch to confirm shipping options and freight costs.

Ready to upgrade? Browse all Mazda BT-50 exhaust systems

Disclaimer: The turbo back exhaust system for 2016-on 4JJ3 models are intended strictly for off-road racing, ADF, mining vehicles, overseas models exempt from Australian Design Rules (ADR) or vehicles with valid Primary Producer exemptions. Installing this product on a 2016-on model renders the vehicle non-compliant with ADR standards for road use. It is the owner's responsibility to verify regulatory compliance before purchasing.