Buying guide
Engine and driveline add-ons explained
Catch cans, pre-filters, breathers and throttle controllers are made for specific engines. Here's what to check so the part suits yours.
- Made for your engine
These parts are engine specific, often down to the engine code and build date. Check the listing's fitment against your vehicle.
- What it actually does
A catch can collects oil mist from the engine's breather before it reaches the intake. A pre-filter catches fuel contaminants before the factory filter. A throttle controller changes how the accelerator pedal responds.
- Emissions
VicRoads' general approvals cover most electrical work, but not changes that affect emissions or safety systems (VSI 8). Anything that changes how the engine runs needs that check.
- Servicing
Catch cans need draining and filters need changing on a schedule. Check the maker's service interval before you buy.
Choosing performance upgrades for your 4x4
Modern common rail diesels run tight tolerances and costly injectors, which makes fuel quality one of the bigger risks for a hard working 4x4. A pre-filter kit adds an extra stage of filtration before the factory filter, catching water and fine contaminants before they reach the injection system. It is a sensible upgrade for anyone touring beyond the blacktop.
Start with how you use the vehicle. If you tow, travel remote or run long distances loaded up, fuel protection should sit near the top of your list. Kits such as the Direction Plus PreLine-Plus range are made model by model, so match the kit to your exact vehicle, year and engine, and plan replacement elements into your normal service schedule.
Related categories
Common questions
Does a throttle controller add power?
No. It changes how quickly the engine responds to the accelerator pedal, not the engine's output.
Does a catch can need maintenance?
Yes. The collected oil has to be drained regularly; the maker's instructions give the interval.
Will a performance chip affect my registration?
VicRoads' general approvals don't cover changes that affect emissions (VSI 8). Check how any engine change is approved before fitting it.
