DPF Back Exhaust – Isuzu DMAX 3.0L 4JJ1 (2017-2020) | Outback Exhausts

Description

Overview

The Outback Exhaust ISUZU DMAX 3.0L is a DPF-back performance system designed for 2017–2020 4JJ1 dual cab 4WD models. Built from 409 stainless steel and using mandrel-bent tubing, this Australian-made exhaust bolts straight up to the factory mounting points on your ISUZU DMAX. Available in 3″ or 3.5″ exhaust sizes, it delivers improved exhaust flow, a tougher note and long-term reliability for tuned, touring or towing setups.

This system replaces the factory DPF-back section with a high-flow exhaust system and is available with either a 3″ or 3.5″ pipe diameter option. Choose from a resonator/small muffler setup for a controlled note or a straight “pipe only” option for a louder, more aggressive sound. Installation is straightforward and usually does not require a hoist, helping reduce workshop time and cost.

Exhaust Options

• 3″ Exhaust: Ideal for daily driving, touring and vehicles wanting improved flow while maintaining a refined exhaust note.
• 3.5″ Exhaust: Designed for higher-flow applications, tuned vehicles and setups requiring maximum exhaust capacity.

Key Features

• Available in 3″ (76 mm) or 3.5″ (89 mm) mandrel-bent DPF-back exhaust sizes for improved flow.
• Proudly made in Australia from 409 stainless steel, ideal for high-temperature exhaust use.
• Engineered as a true bolt-on system using original mounting points – no welding required.
• Choice of sound options: resonator/small muffler or straight pipe with no muffler.
• Includes fasteners and gaskets (turbo/DPF gasket re-used as per manufacturer instructions).
• Designed to enhance power and torque potential when combined with quality tuning.
• Delivers a strong, refined exhaust note tailored to the 3.0L 4JJ1 turbo diesel.
• Backed by a 5-year warranty on the exhaust system (extractors, where used, carry 2-year warranty).

Why Choose This Outback System?

• Improved exhaust efficiency helps the engine breathe more freely under load and when towing.
• Mandrel bends maintain internal diameter through each curve, reducing restriction.
• 409 stainless steel provides excellent durability for harsh Australian 4×4 conditions.
• Choose the exhaust size that best suits your driving style and performance goals.
• Bolt-on design keeps installation simple and repeatable for professional workshops.

Specifications

• Vehicle make: ISUZU
• Vehicle model: DMAX Ute, Dual Cab, 4WD only
• Engine: 3.0 L 4JJ1 turbo diesel
• Year range: 2017 to 08/2020
• System type: DPF-back exhaust
• Exhaust size options: 3″ or 3.5″
• Material: 409-grade stainless steel
• SKU: OE1690

What’s in the Box

• Engine pipe section
• Muffler pipe or pipe-only section (depending on selected sound option)
• Tail pipe section
• Fitting kit – nuts, bolts and gaskets (turbo/DPF gasket re-used)

Compatibility

This Outback Exhaust ISUZU DMAX 3.0L system suits:

• ISUZU DMAX dual cab Ute
• 4WD models only
• 3.0L 4JJ1 turbo diesel engine
• Model years 2017 up to August 2020
• Vehicles running the factory DPF in the original location (DPF-back configuration)

Delivery & Lead Times

Outback Exhausts systems are shipped Australia-wide and worldwide. Some kits are freighted in two boxes due to weight and size. A true business address is recommended for freight, as surcharges may apply for remote or difficult-to-access locations. Remote area deliveries can attract additional charges, which are confirmed with you before dispatch. You always retain the option to cancel if freight pricing is not suitable.

Professional Fitting Service on the Sunshine Coast

Sunshine Coast Diesel Tuning offers professional supply and installation of the Outback Exhaust ISUZU DMAX 3.0L DPF-back system for 2017–2020 models. Available in 3″ or 3.5″ exhaust sizes, our technicians ensure correct fitment, clearance and gasket sealing, then torque-check all fasteners after installation.

We can also combine this exhaust system with custom ECU tuning to unlock the best possible performance and drivability from your DMAX. Contact our workshop to discuss pricing, booking times and package options.