HPD Special Parts
Taxes included. Shipping calculated at checkout.
Couldn't load pickup availability
HPD's forward-facing intake manifold is precision-engineered for front-mount intercooler builds on the 4JJ1 platform. Designed for serious power builders, this manifold delivers massive airflow improvements, sharper throttle response, and a cleaner engine bay layout purpose-built for big-turbo setups and high-performance applications.
This HPD manifold replaces the tight, restrictive factory runner layout with a forward-facing plenum design that flows directly to your front-mount intercooler. The result is dramatically improved airflow efficiency, reduced restriction, and optimized charge air delivery for maximum performance potential.
Ideal for high-performance builds, big-turbo upgrades, competition vehicles, and anyone serious about optimizing 4JJ1 intake efficiency for genuine power gains.
Performance Benefits:
⚠️ Performance Build Component: This manifold is designed for serious performance builds requiring ECU tuning, custom fabrication, and supporting modifications. Not a bolt-on upgrade for stock vehicles. Intended for experienced builders or professional installation.
This HPD forward-facing intake manifold is engineered specifically for Isuzu 4JJ1-TC 3.0L turbo diesel engines in the following vehicles:
✅ Required for Installation:
❌ NOT Compatible With:
The following components must be sourced separately or custom fabricated for complete installation:
💡 Build Planning: Custom fabrication is required for intercooler piping and coolant rerouting. This manifold is designed for experienced builders or professional workshop installation. Plan your complete build before ordering to ensure all supporting modifications are accounted for.
⚠️ PROFESSIONAL INSTALLATION STRONGLY RECOMMENDED
This is a performance component requiring custom fabrication, ECU tuning, and supporting modifications. Not suitable for DIY installation unless you have extensive diesel performance build experience.
Typical Workshop Time: 2-4 days for experienced diesel performance shop
(Includes manifold installation, piping fabrication, coolant rerouting, battery relocation, and ECU tuning)
💡 Workshop Recommendation: Choose a workshop experienced with Isuzu diesel performance builds, custom intercooler fabrication, and ECU tuning. A competent shop will understand the complete scope of work required and can advise on supporting modifications for your power goals.
Q: Do I need ECU tuning?
A: Yes, absolutely. ECU tuning is mandatory for correct operation due to significant airflow changes and EGR system removal. The engine requires recalibration for fuel delivery, boost control, and air/fuel ratios. Without tuning, the vehicle will run poorly or may not run at all.
Q: What kind of power gains can I expect?
A: Power gains depend entirely on your complete build (turbo size, fueling, tuning, exhaust). The manifold itself doesn't make power — it removes restriction and enables larger turbo upgrades and higher boost levels to make more power. Think of it as a supporting modification for big-power builds (250+ kW at the wheels).
Q: Can I tune this myself with a plug-in tuner?
A: No. This requires professional custom ECU remapping on a chassis dyno. Plug-in tuners and pre-programmed tunes won't account for the manifold change, EGR delete, and your specific build configuration. Professional dyno tuning is essential.
Q: What tuner should I use?
A: Choose a tuner experienced with Isuzu 4JJ1 performance builds, preferably one familiar with forward-facing manifold setups. Ask for references and examples of similar builds. A good tuner will verify all supporting modifications before starting the tuning process.
Q: Will this work with a factory top-mount intercooler?
A: No. This manifold is designed specifically for front-mount intercooler setups. The forward-facing plenum routes charge air forward to a FMIC, not upward to a top-mount. If you're running factory intercooler, this manifold is not suitable.
Q: Do I need custom piping?
A: Yes, absolutely. Custom intercooler pipework must be fabricated to suit your specific front-mount intercooler layout, turbo configuration, and chassis. Every build is different, so off-the-shelf piping kits don't exist. Expect professional aluminum welding/fabrication work.
Q: What size FMIC should I run?
A: For big-power 4JJ1 builds (250+ kW), a large front-mount intercooler (600×300×76mm or larger) is recommended. Core size depends on your power goals, turbo selection, and available chassis space. Consult with your fabricator/tuner.
Q: How much does custom piping cost?
A: Professional aluminum intercooler piping fabrication typically costs $1,500-3,000+ depending on complexity, materials (mandrel-bent aluminum, silicone couplers, T-bolt clamps), and workshop rates. Get quotes from experienced fabricators before committing to the build.
Q: Does this delete the EGR system?
A: Yes. The manifold has an integrated EGR delete — there's no provision for EGR valve mounting. A coolant bypass must be installed as part of the conversion to reroute coolant around the missing EGR cooler.
Q: Is EGR delete legal?
A: EGR delete is generally illegal for road-registered vehicles in most Australian states and territories. This manifold is intended for off-road, competition, or motorsport use. It's the buyer's responsibility to confirm legal compliance before installation. Check your state/territory regulations.
Q: Will this pass roadworthy inspection?
A: Likely not if emissions equipment inspection is performed. EGR delete typically fails compliance in most jurisdictions. This product is intended for competition/off-road use.
Q: How do I install the coolant bypass?
A: The EGR cooler normally routes coolant through it. With the manifold having no EGR provision, you must fabricate bypass lines to reroute coolant around the missing cooler. Your installer will need to create custom coolant hoses to complete the circuit.
Q: Will the battery need relocation?
A: In most 4JJ1 FMIC builds, yes — required for intercooler piping clearance. The factory battery location typically interferes with the cold-side intercooler piping route. Plan for battery relocation to the tray area, under-seat, or cargo area.
Q: Where should I relocate the battery?
A: Common locations include chassis rail mounting (opposite side), under-seat installation, or cargo area. Your fabricator can advise on the best location for your specific build. Ensure proper battery securing, cable sizing, and ventilation.
Q: How much does battery relocation cost?
A: Professional battery relocation typically costs $500-1,500 depending on location chosen, cable lengths required, and mounting fabrication. Factor this into your build budget.
Q: Will this fit my D-MAX/Colorado/Rodeo?
A: This manifold fits 4JJ1-TC engines (2006-2012) in D-MAX, Colorado RC, and RA7 Rodeo. It does NOT fit 4JJ3 engines (2020+) as they have different manifold bolt patterns and configurations.
Q: Can I use this on a 4JJ3 engine?
A: No. The 4JJ3 has a different intake manifold design, bolt pattern, and engine configuration. This manifold is 4JJ1-specific only.
Q: Will this work with my turbo upgrade?
A: Generally yes — this manifold is designed to support big-turbo upgrades. However, turbo positioning and compressor outlet routing must be compatible with your FMIC piping layout. Consult with your fabricator before ordering if running custom turbo positioning.
Q: Do I need to upgrade my turbo at the same time?
A: Not necessarily, but most people installing this manifold are building for big power and upgrade the turbo simultaneously. The manifold supports factory turbo or aftermarket big-turbo setups. Your power goals dictate whether turbo upgrade is necessary.
Q: Can I install this myself?
A: Only if you have extensive diesel performance build experience, custom fabrication skills (aluminum welding, piping fabrication), and access to ECU tuning services. For most people, professional installation is essential. This isn't a bolt-on part.
Q: How long does installation take?
A: For an experienced diesel performance shop: 2-4 days including manifold installation, intercooler piping fabrication, coolant rerouting, battery relocation, and ECU tuning. Timeline varies based on build complexity and workshop schedule.
Q: What's the total cost of installation?
A: Budget $3,000-6,000+ for professional installation including labor, custom piping fabrication, battery relocation, coolant bypass fabrication, and ECU tuning. Costs vary by workshop and build complexity. Get detailed quotes before starting.
Q: Should I do other modifications at the same time?
A: Yes! If you're already paying for workshop time, piping fabrication, and tuning, it makes sense to do related upgrades simultaneously (turbo upgrade, exhaust, fueling, transmission). Plan your complete build to avoid duplicate labor costs.
Q: Is this genuine HPD?
A: Yes! Authentic HPD Special Parts manufactured in Thailand to HPD's performance engineering standards. We import directly from HPD Thailand.
Q: What's the quality like?
A: HPD manufactures this manifold to high standards with precision casting, professional black powdercoat finish, and proven performance in competition applications. Quality is significantly higher than cheap eBay manifolds.
Q: Does HPD offer a warranty?
A: HPD products come with manufacturer's warranty against defects in materials and workmanship. Contact us if you experience any issues. Note that warranty doesn't cover installation errors or damage from excessive boost/power beyond design limits.
Q: Has this been proven in competition?
A: Yes — HPD parts are used in competition diesel vehicles throughout Asia and Australia. This manifold design has been proven in high-power 4JJ1 builds making serious power on the dyno and in motorsport applications.
Q: How quickly will this ship?
A: Usually ships within 1-2 business days if in stock. Free express shipping to all Australian addresses. If you need urgent delivery, contact us before ordering to confirm stock availability.
Q: What if it's out of stock?
A: We can arrange pre-orders with estimated delivery timeframes from Thailand (typically 2-4 weeks). Contact us for current stock status if your build timeline is tight.
Q: Do you ship internationally?
A: Yes! Contact us with your location for international shipping quote. We regularly ship HPD performance parts worldwide.
Q: Can I return this if I change my mind?
A: Items must be unused and in original packaging for returns. Given the specialized nature of this component and required supporting modifications, please ensure this manifold suits your build before ordering. Contact us if you need fitment advice.
Q: I'm planning a big-power build — where should I start?
A: Start by finding an experienced diesel performance workshop that specializes in Isuzu 4JJ1 builds. They can help you plan the complete build (manifold, turbo, intercooler, fueling, transmission, tuning) and provide a realistic timeline and budget.
Q: What should my build budget be?
A: For a complete big-power 4JJ1 build (manifold, turbo, intercooler, piping, fueling, tuning, transmission): expect $15,000-30,000+ depending on parts quality and power goals. Performance builds aren't cheap — budget realistically before starting.
Q: Can you recommend a workshop?
A: We can provide general recommendations for experienced diesel performance shops in various regions. Contact us with your location and we'll point you in the right direction.
HPD forward-facing manifold for serious FMIC builds. Professional installation required. Built for competition performance.
