Best Exhaust for 79 Series LandCruiser with DPF: The 2025 Buyer's Guide

 

If you've just picked up a post-2016 Toyota 79 Series LandCruiser, you already know the factory exhaust is strangling your engine. The stock system is restrictive by design, built to pass emission standards at the lowest possible cost, not to perform. The good news? There's a proper legal upgrade available, and it makes a real difference.

This guide covers everything you need to know about upgrading the exhaust on a DPF-equipped VDJ79, including which pipe size suits your setup, the difference between stainless grades, what's legal in Australia, and which exhaust builds suit touring, towing, and tradie use.

Browse Our 79 Series DPF Exhaust Systems

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Why 79 Series Owners Upgrade Their Exhaust

The VDJ79 runs Toyota's 4.5-litre twin-turbo V8 diesel, a legendarily tough engine. But factory exhaust systems on post-2016 models are built around meeting emissions targets, not extracting performance. The result is elevated exhaust gas temperatures (EGTs), restricted flow, and a sound that doesn't do justice to what's under the bonnet.

Here's what most owners notice before they upgrade:

• High EGTs under load, especially when towing or climbing
• Sluggish throttle response compared to older, pre-DPF 79s
• Flat midrange power output
• Constant DPF regeneration cycles on highway runs
• A quiet, muffled exhaust note that doesn't match the engine's character

A quality DPF-back exhaust addresses all of this without breaking any laws. You keep your DPF in place, maintain your ADR compliance and warranty, and still get the benefits of a high-flow system.

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DPF-Back vs Turbo-Back: Which Is Right for the 79 Series?

This is where a lot of buyers get confused. Let's clear it up.

DPF-Back Exhaust

A DPF-back system bolts directly onto the rear of the factory diesel particulate filter, replacing everything downstream. It's 100% road-legal in Australia, doesn't affect your manufacturer's warranty, and complies with ADR 79/00. This is the correct choice for any 79 Series used on public roads.

Turbo-Back Exhaust

A turbo-back system replaces everything from the turbocharger outlet back, including the DPF. For post-2016 VDJ79 models, this means removing the DPF entirely, which is illegal for on-road use in all Australian states and territories. Fines in NSW alone can reach $10,000 under the Protection of the Environment Operations Act. It also voids your vehicle warranty.

Turbo-back systems are sold for off-road and racing applications only. If your 79 Series drives on public roads, even for a single trip, a DPF-delete pipe is not a legal option.

Bottom line: For any road-registered 79 Series LandCruiser, the answer is a DPF-back exhaust. Full stop.

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Is a DPF Delete Legal in Australia? (2025 Update)

Short answer: No, not for any vehicle used on public roads.

Australia's ADR (Australian Design Rules) require that any factory emission control device fitted to a vehicle must remain in place for the life of that vehicle's on-road operation. Removing or bypassing the DPF on a road-registered 79 Series is an offence under both federal ADRs and state environmental protection legislation.

Penalties vary by state but are serious:

• NSW: Up to $10,000 under the Protection of the Environment Operations Act
• QLD: Fines under the Environmental Protection Act 1994
• VIC: Enforcement under the Environment Protection Act 2017

Beyond fines, a DPF-deleted vehicle is considered unroadworthy and uninsured for most standard policies. If you're involved in an accident with a defected vehicle, your insurer may not cover you.

There are narrow exemptions for primary producers, defence vehicles, and registered racing vehicles, but for the vast majority of 79 Series owners, the legal, smart, and practical choice is a high-flow DPF-back system.

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3" vs 3.5" vs 4" Exhaust: Which Size Suits Your 79 Series?

Pipe size is one of the most argued topics in the 79 Series community. Here's what the data and real-world experience actually shows.

3 Inch (76mm)

A 3" DPF-back exhaust is a solid entry point. You'll notice a meaningful improvement over stock in terms of EGT reduction and exhaust note, and installation is typically straightforward. For a lightly loaded daily driver or a mostly highway cruiser, a 3" system does the job. That said, once you start adding weight, whether a full touring load, a caravan, or a tradie tray stacked with gear, the 3" starts to become a limiting factor on sustained performance.

3.5 Inch (89mm)

For most 79 Series owners, the 3.5" is the sweet spot. It delivers noticeably better flow than a 3", produces a deeper exhaust note, and handles the demands of loaded touring and towing without becoming excessive. It's the go-to size for owners who cover serious kilometres with a camper or heavy tray setup. Multiple top Australian brands manufacture their best 79 Series systems in 3.5".

4 Inch (102mm)

The 4" is the choice for owners who want maximum flow, typically those running a remap or performance tune, or those building a dedicated outback expedition vehicle. Sound levels at 4" are noticeably louder, and on a tuned engine, the flow benefits are more significant. For a stock-tune 79 Series, a 4" system can occasionally reduce exhaust velocity enough to affect torque at lower RPMs, though real-world impact is minimal with a quality system design.

Pipe Size	Flow Improvement	Sound Level	EGT Reduction	Best For	Tuned Engine?
3 Inch	Good	Deep, subtle	Moderate	Daily driver, light touring	Stock / mild
3.5 Inch	Better	Deep, present	Good	Touring, towing, tradie	Stock or tuned
4 Inch	Maximum	Loud, aggressive	Best	Tuned builds, expedition	Tuned recommended

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304 vs 409 Stainless Steel: Which Is Better for the 79 Series?

Both grades are used in quality Australian exhaust systems, but they're not the same material, and the difference matters depending on how and where you use your 79.

409 Stainless Steel

409 is a ferritic stainless with lower chromium and nickel content. It's heat-resistant up to around 675 degrees C, which covers the normal operating range of a DPF-back exhaust. It's more affordable, and many high-quality systems use it throughout or as an economical option for the main pipe run. The tradeoff is that 409 can develop light surface oxidation over time, particularly in coastal environments or areas with high moisture exposure. Appearance is more matte than polished.

304 Stainless Steel

304 is an austenitic grade with significantly higher chromium and nickel content. It handles elevated temperatures better than 409 and resists corrosion more effectively, particularly in coastal Queensland, the NT, and WA salt environments, and has a superior polished finish. For sustained high-EGT use cases like heavy towing or long outback runs, 304's higher heat tolerance is a genuine advantage. Most premium 79 Series exhaust brands use 304 on their flagship systems, and it typically comes with longer warranty coverage.

Feature	409 Stainless	304 Stainless
Heat Tolerance	Up to ~675°C	Higher threshold
Corrosion Resistance	Good in dry climates	Superior, including coastal
Finish / Appearance	Matte	Polished / mirror finish
Price	More affordable	Premium (worth it for tourers)
Best For	Inland / dry climates, budget builds	Coastal, touring, heavy towing
Warranty (typical)	3–5 years	5–10+ years

Recommendation: If you're doing serious kilometres, running near the coast, towing regularly, or just want to buy once and forget about it: choose 304 stainless. It's the better long-term investment for how most 79 Series owners actually use their vehicles.

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View Our Full Range of 79 Series Performance Exhausts

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Best Exhaust Setup by Use Case

Touring Builds

If your 79 Series is set up for the Cape, the Gibb, or the Canning: you're carrying heavy loads, running elevated EGTs for hours at a time, and covering thousands of kilometres between services. For a touring build, a 3.5" or 4" system in 304 stainless is the right call. Look for systems with a quality muffler and resonator combination that reduces drone on long highway stretches without killing the sound. Heat tolerance and corrosion resistance matter more here than anywhere else.

Towing Applications

Towing a caravan, horse float, or heavy trailer puts sustained load on the engine and creates consistently elevated EGTs. A 3.5" DPF-back exhaust in 304 SS is ideal: it provides enough flow to meaningfully reduce EGTs under tow while keeping the noise level manageable for long hauls. Pair it with a quality EGT gauge so you can monitor temperatures on the road. A remap on top of the exhaust upgrade will compound the benefits significantly.

Tradie Setups

Tradies running a loaded tray or service body five days a week need reliability above all else. A 3" or 3.5" DPF-back system in 409 stainless is a cost-effective choice that will still noticeably improve performance and longevity versus stock. Sound level matters in suburban environments, so look for a system with a quality resonator that keeps things civil without turning heads on residential streets at 6am.

Tuned Vehicles

If you've already invested in a remap or are planning to, a 3.5" or 4" DPF-back exhaust is effectively mandatory. A tune without a proper exhaust upgrade is leaving significant gains on the table. The tune expands the engine's operating parameters, and a high-flow exhaust gives those gases somewhere to go. For tuned 79 Series builds, the 4" systems from Australian manufacturers are designed specifically with this in mind.

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Sound Level Guide: What to Expect

Sound is deeply personal, but it's worth understanding what different exhaust configurations actually produce before you buy.

• 3" single exit: Noticeably deeper than stock. Subtle improvement in V8 character. Minimal cabin drone. Appropriate for daily driving and urban use.
• 3.5" single exit: A clear step up. Proper V8 diesel rumble at startup and under load. Highway drone is manageable with a quality muffler/resonator setup.
• 4" single exit: Loud and aggressive. Expect attention at traffic lights. Great for builds that spend more time off-road or on the highway.
• Twin exit (any size): Visually impressive and produces a broader sound stage. Sound characteristics depend heavily on the specific muffler and resonator design; quality varies significantly between brands.

Key tip: Don't choose an exhaust purely on sound clips. Sound varies based on your specific cabin configuration (single cab vs dual cab vs wagon), whether you run a toolbox or canopy over the tailgate area, and even your tyre noise at highway speeds. Ask for fitment-specific feedback from owners with your exact body style.

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Exhaust Brands: What's Available for the 79 Series in Australia

The Australian aftermarket for 79 Series exhausts has matured significantly over the past few years. There are now genuine options across every price point and use case. Without endorsing specific brands, here's what to look for and what's commonly talked about in the community:

• Mandrel-bent tubing: Non-mandrel bends restrict flow at every corner. Mandrel bending maintains consistent diameter through curves. This is non-negotiable on a quality system.
• Flange design: A proper ball-joint flange at the DPF connection point prevents leaks and makes installation and removal straightforward.
• Muffler and resonator quality: Cheap mufflers create drone. A well-designed straight-through muffler with quality packing material (stainless wool and fibreglass, not just fibreglass) maintains sound quality over thousands of kilometres.
• Warranty: Legitimate Australian exhaust brands back their stainless systems with meaningful warranties, typically 5 to 10 years on 304 SS systems. Any brand offering less is worth scrutinising.
• Australian-designed and fitted: Systems engineered specifically for VDJ79 body styles (single cab, dual cab) will fit correctly first time. Generic systems often require modification at the rear, particularly on dual cab models where the DPF exit angle varies.

System Type	Size	Material	Legal?	Use Case	Approx. Price Range
DPF-Back Single Exit	3"	409 SS	✓ Yes	Daily driver, tradie	$600–$900
DPF-Back Single Exit	3.5"	304 SS	✓ Yes	Touring, towing	$900–$1,400
DPF-Back Single Exit	4"	304 SS	✓ Yes	Tuned builds, outback	$1,100–$1,600
DPF-Back Twin Exit	3.5" / 4"	304 SS	✓ Yes	Touring, show builds	$1,200–$1,800
Turbo-Back (DPF delete)	3–4"	409 / 304 SS	✗ Illegal (on-road)	Off-road / racing only	$800–$1,500

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How to Choose the Right Exhaust for Your 79 Series Setup

Work through these four questions and you'll land on the right system every time.

1. What body style is your 79?
Single cab and dual cab 79s have different DPF exit angles and different rear body configurations. Make sure any system you buy is specifically designed for your variant, not a universal fit bodged to work.

2. How do you primarily use your vehicle?
Daily driver or tradie ute: 3" or 3.5" system. Regular touring and towing: 3.5" system in 304 SS. Tuned or expedition-spec: 4" system.

3. Is your engine tuned or stock?
A stock engine extracts solid gains from a 3.5" DPF-back system. A tuned engine warrants stepping up to 4" to match the increased gas volume the tune is producing. If you're planning to tune in the future, it makes sense to buy the 4" system now.

4. Where do you operate?
Coastal QLD, NT, WA, and tropical environments are tough on exhaust systems. Choose 304 stainless if you're anywhere near salt air or high humidity. Inland and arid climates give more room to consider 409 SS as a cost-effective option.

Shop 79 Series DPF Exhaust Systems

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Does a DPF-Back Exhaust Void Your Warranty?

No. A DPF-back exhaust fitted to a post-2016 VDJ79 does not void your Toyota factory warranty, provided it retains the DPF in place. The key distinction is that you are not modifying or removing an emission control device; you're replacing the downstream exhaust system only.

However, there are caveats worth understanding:

• Toyota dealers may attempt to link exhaust modifications to warranty claims, particularly for drivetrain issues. This is known as causation: they need to prove the modification caused the issue, not just that a modification exists.
• Some brands supply compliance documentation specifically to support warranty discussions with dealers. This is worth asking about when you purchase.
• A DPF delete, regardless of how it's marketed, voids your warranty immediately and completely.

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Installation: DIY or Workshop?

Most quality DPF-back exhaust systems for the 79 Series are designed for DIY installation and can be fitted in 60–90 minutes with basic hand tools. The connection point is a flanged joint at the rear of the DPF, which bolts directly to the new system. No welding is required for a standard fitment.

That said, if you're adding other underbody components such as protection plates, long-range tanks, or suspension, it's often worth fitting the exhaust at the same time through a workshop to minimise the number of times you're working underneath.

Always torque exhaust flanges to spec and re-check after the first few heat cycles (typically 500km). New systems can settle slightly as the metal expands and contracts through temperature cycles, and a minor retorque prevents small exhaust leaks at the DPF junction.

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Frequently Asked Questions

What is the best exhaust for a 79 Series LandCruiser with DPF?

The best exhaust for a DPF-equipped 79 Series LandCruiser is a DPF-back system in 3.5" or 4" mandrel-bent 304 stainless steel. This keeps your vehicle road-legal, reduces EGTs, improves throttle response, and delivers a deep V8 diesel note without removing the factory DPF.

Is a DPF delete legal in Australia for the 79 Series?

No. Removing the DPF from a road-registered vehicle is illegal in all Australian states and territories under the Australian Design Rules (ADR 79/00) and state environmental legislation. Fines can reach $10,000 in NSW. DPF delete products are sold for off-road and racing use only.

What's the difference between a DPF-back and a turbo-back exhaust?

A DPF-back exhaust bolts onto the rear of the factory DPF and replaces everything downstream: it's road-legal. A turbo-back exhaust replaces everything from the turbo outlet, including the DPF, making it illegal for on-road use on post-2016 models.

Does a DPF-back exhaust improve performance on the 79 Series?

Yes. A high-flow DPF-back exhaust reduces backpressure, lowers exhaust gas temperatures (EGTs), improves throttle response, and, particularly when paired with a tune, delivers measurable power and torque gains. The improvement is real even on a stock-tune engine.

What size exhaust should I get for my 79 Series?

For a daily driver or light tourer, a 3" system is sufficient. For regular touring, towing, or a loaded tradie ute, step up to 3.5". For tuned engines or dedicated outback builds, go 4". Body style (single vs dual cab) should also be considered when selecting a fitment.

Does fitting a DPF-back exhaust void my Toyota warranty?

A DPF-back exhaust, which retains the factory DPF, does not void your Toyota warranty. A turbo-back system with a DPF delete does. Always keep documentation of your exhaust installation and the product's compliance status.

Is 304 or 409 stainless better for a 79 Series exhaust?

304 stainless is the premium choice: it offers superior corrosion resistance, handles sustained high EGTs better, and typically carries longer warranty coverage. 409 stainless is a cost-effective alternative for vehicles in dry inland climates that are used predominantly as daily drivers.

Can I fit a 79 Series exhaust myself?

Most DPF-back systems are designed for DIY installation and can be fitted in 60–90 minutes with basic hand tools. No welding is required. Re-check flange torque after the first 500km as the system settles through heat cycles.

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Ready to Upgrade Your 79 Series Exhaust?

The factory exhaust on a post-2016 VDJ79 is the single easiest performance gain most owners leave on the table. A proper DPF-back system is road-legal, warranty-safe, and immediately noticeable: better sound, lower EGTs, improved throttle response, and a visual upgrade under the body that complements any build.

Whether you're running a fully loaded touring rig up the Gibb River Road, towing a van across the Nullarbor, or hauling gear to site every morning, there's a 79 Series DPF exhaust setup built specifically for your use case.

We stock a curated range of proven 79 Series DPF exhaust systems from trusted Australian brands, in 3", 3.5", and 4" configurations, single and twin exit, 304 and 409 stainless. Every system in our range is DPF-back, road-legal, and specifically engineered for Australian conditions.

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