Airbox upgrades on the D22 Navara YD25 follow very similar principles to the D22 ZD30DI.
From factory, the intake system is functional but not particularly optimised for increased airflow, improved sealing, or higher-performance applications.
Factory Airbox Limitations
The factory YD25 airbox:
- Can be restrictive at higher airflow levels
- Is not especially well sealed against dust compared to some aftermarket options
- Becomes more of a limitation once tuning or turbo upgrades are introduced
For a completely stock vehicle, it performs adequately. However, once boost and airflow are increased, reducing intake restriction helps improve response and overall efficiency.
Even with a basic tune, upgrading the intake system can result in:
- Improved throttle response
- Smoother power delivery
- Better airflow consistency
Dual Battery Consideration
One unique consideration on the D22 YD25 Navaras is the dual battery setup.
The secondary battery is often located in an area that would otherwise be ideal for a larger or upgraded airbox.
In most Australian climates, it is typically acceptable to run a single quality battery rather than a factory-style dual battery configuration. Removing the second battery can free up space for:
- A larger aftermarket airbox
- Improved intake routing
- Cleaner snorkel integration
As always, battery configuration should suit your vehicle usage (touring, accessories, winches, etc.).
Snorkel Integration
Upgraded airboxes generally:
- Seal better than factory units
- Integrate more effectively with snorkels
- Reduce the risk of dust or water ingress
If fitting a snorkel, pairing it with a properly sealed aftermarket airbox is strongly recommended rather than relying solely on the factory setup.
Choosing an Upgrade
There are several aftermarket airbox options available today that:
- Offer improved airflow
- Provide better sealing
- Are purpose-built for performance applications
As with any intake upgrade, quality matters. Proper sealing, durable construction, and proven dust control should be prioritised over appearance alone.
Summary
- Similar upgrade principles as the D22 ZD30DI
- Factory airbox can be restrictive once tuned
- Aftermarket airboxes improve airflow and response
- Many YD25 models have a secondary battery occupying airbox space
- In Australian climates, running a single battery is often sufficient
- Upgraded airboxes integrate better with snorkels
On the D22 YD25, an airbox upgrade is a practical performance and reliability improvement — particularly when combined with tuning or turbo upgrades.