HPD CNC Alloy Side Exit Breather

Made by HPD Special Parts Thailand, this side exit crankcase breather provides a clean routing solution for 4JJ1 and 4JJ3 engines. The side-exit design allows for flexible hose routing away from hot components and tight spaces, making catch can plumbing cleaner and more professional.

Key Features:

• 🔧 Side exit design — clean hose routing for catch can setups
• 🔧 CNC-machined alloy construction — precision fit and durability
• 🔧 Direct bolt-on fitment — replaces factory breather outlet
• 🔧 Compatible with -10AN adapter — for professional catch can plumbing (adapter sold separately)
• 🔧 Thai-manufactured HPD quality — proven reliability

⚠️ Important: Not compatible with 4JJ1-TC models running factory top-mount intercoolers.

Suits 4JJ1 and 4JJ3 Isuzu Engines

This HPD side exit crankcase breather is compatible with the following vehicles equipped with Isuzu 4JJ1-TC or 4JJ3-TCX engines:

4JJ1-TC 3.0L Turbo Diesel (2007-2020):

• Holden Rodeo RA7 (2007–2008)
• Holden Colorado RC (2008–2012)
• Isuzu D-MAX (4JJ1) (2008–2020)
• Isuzu MU-X (4JJ1) (2013–2020)

4JJ3-TCX 3.0L Turbo Diesel (2020-Onwards)*:

• Isuzu D-MAX (4JJ3) (2020–Onwards)
• Isuzu MU-X (4JJ3) (2020–Onwards)
• Mazda BT-50 (4JJ3-TCX) (2020–Onwards) — Isuzu platform

* 4JJ3 installations require 4 × 8G (4.2 × 30 mm) pan-head stainless steel self-tapping screws with max head diameter 8.5mm (not included).

Important Compatibility Notes

❌ NOT Compatible: 4JJ1-TC models running factory top-mount intercoolers — clearance conflict. Verify intercooler configuration before ordering.

Kit Contents

• ✅ 1 × HPD Side Exit Crankcase Breather — 4JJ1/4JJ3 (CNC alloy)

Not Included (Required for 4JJ3 Installation)

• ❌ 4 × 8G (4.2 × 30 mm) pan-head stainless steel self-tapping screws (max head Ø 8.5mm)
• ❌ -10AN push-in adapter (available here)
• ❌ Catch can plumbing hoses and fittings

Basic Installation Process

1. Remove factory breather outlet and clean sealing area
2. Position HPD side-exit breather and mark holes (if required for 4JJ3)
3. Fasten using recommended hardware — do NOT overtighten
4. Route hose to catch can or safe vent point and secure with clamps

Required Tools & Hardware

• Phillips or hex driver (depending on screw type)
• 4 × 8G (4.2 × 30 mm) stainless pan-head self-tappers (4JJ3 only)
• Medium-strength thread locker (recommended)
• -10AN adapter and braided hose (if connecting to catch can with -10AN fittings)

💡 Pro Tip: Use medium-strength thread locker on self-tapping screws to prevent loosening from vibration. Don't overtighten — just snug is sufficient for proper sealing.

• 💸 Buy Now, Pay Later: Afterpay, Humm, Klarna & Zip available
• ✈️ Free Express Shipping Australia-Wide on all orders
• 📦 Fast dispatch — same-day or next-day dispatch when in stock
• 📍 Express, trackable delivery to all Australian addresses
• 🇦🇺 All major credit cards accepted
• 🌏 International orders: Contact us for international shipping quote

Current Stock Status: Usually in stock and ready to ship. Occasionally a 1–3 week wait may apply depending on demand from HPD Thailand.

Need it urgently? Message us before ordering to confirm current stock availability and exact dispatch timeframes.

Q: Will this fit both 4JJ1 and 4JJ3 without modifications?

A: Yes, it's a bolt-on for both engines. For 4JJ3, you'll need suitable mounting screws (4 × 8G pan-head self-tappers, not included). 4JJ1 typically uses existing hardware.

Q: Is it compatible with factory top-mount intercoolers?

A: No — not compatible with 4JJ1-TC models running factory top-mount intercoolers due to clearance conflicts. Check your intercooler configuration before ordering.

Q: Do I need the -10AN adapter?

A: The -10AN adapter is recommended if you're running a catch can with -10AN fittings. It provides proper sealed connection and professional appearance. You can also use alternative hose connections depending on your catch can setup.

Q: What's the difference between side exit and top exit breathers?

A: Side exit routes the breather outlet to the side (horizontal), while top exit routes upward (vertical). Choose based on your engine bay layout, intercooler piping, and catch can positioning. Side exit is often better for tight spaces or when top clearance is limited.

Q: Where can I get the mounting screws for 4JJ3?

A: Any hardware store or fastener supplier should stock 8-gauge (4.2 × 30mm) stainless steel pan-head self-tapping screws. Ensure max head diameter is 8.5mm. Alternatively, contact us and we may be able to include them with your order.

Q: Can I vent this to atmosphere instead of a catch can?

A: Technically yes, but we don't recommend it. Venting crankcase gases directly to atmosphere releases oil mist and vapors. A catch can is the proper solution for capturing oil vapor while allowing clean air to vent.

Q: How do I know if I have a top-mount or front-mount intercooler?

A: Factory 4JJ1 typically has a top-mount intercooler (sits on top of engine). If you've done an FMIC (front-mount intercooler) conversion, you'll know — it's a major modification. If unsure, your intercooler is likely the factory top-mount.

Q: Will this work with my HPD alloy rocker cover?

A: Yes — this breather is compatible with both OEM factory rocker covers and HPD alloy rocker covers for 4JJ1/4JJ3 engines.

Q: How quickly will this ship?

A: Usually same-day or next-day dispatch if in stock. Free express shipping to all Australian addresses. If you need urgent delivery, contact us before ordering to confirm stock availability.

Q: Can I return this if it doesn't fit?

A: Items must be unused and in original packaging for returns. Please verify compatibility (especially intercooler type) before ordering. Contact us if uncertain about fitment — we'll confirm before you buy.