Flex
Flex F55 Boost X Kit | N70 1KD | 300+ RWHP | 45 PSI | High-Mount
Flex F55 Boost X Kit | N70 1KD | 300+ RWHP | 45 PSI | High-Mount
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High-Mount Kit | 300+ RWHP Capable | 45 PSI Rated
A high-mount kit for Toyota Hilux N70 1KD-FTV builds chasing serious airflow and sustained power. Built for 300+ RWHP applications with the right fuel system, intercooler and ECU calibration.
Not a "55mm turbo". Turbos get described online with a single diameter, which says nothing useful about airflow, efficiency or power. The F55 name refers to the original turbo frame class (RHF55), not a compressor measurement. The Boost X is built around real-world flow, turbine efficiency and durability: strong mid-to-top-end power without excessive drive pressure or overspeed.
Key Features
- High-flow compressor and turbine pairing matched to 1KD airflow demands
- Ultra S-Curve turbine for reduced back-pressure and improved efficiency
- Up to 45 PSI capable with appropriate fuelling and tuning
- PPRC stainless high-mount manifold and dump pipe
- Complete kit: turbo, manifold, dump, oil and coolant lines, hardware
- Designed for big fuel, big air, custom-tuned builds
Technical Specifications
- Turbo: Flex F55 Boost X
- Compressor: high-flow 7-blade design
- Turbine: Ultra S-Curve design
- Power capability: 300+ RWHP with supporting mods and appropriate tuning
- Boost rating: 45 PSI max, recommended daily boost 35 PSI
- Manifold: PPRC stainless high mount
- Setup: suits front-mount intercooler configuration
What Is Included
- Flex Boost X turbocharger
- PPRC stainless high-mount manifold and dump pipe
- Braided oil feed and return lines with heat shielding
- Aeroflow coolant lines with thermal guards
- Complete fittings kit for oil and coolant connections
- Gaskets (manifold and dump pipe)
- Studs, copper-coated nuts and mounting hardware
Not included: front-mount intercooler, intercooler and intake piping, VNT simulator, 3 inch dump pipe adapter kit.
Vehicle Fitment
- Toyota Hilux N70 / KUN26, 1KD-FTV
Important: front-mount intercooler required. Designed for high-mount manifold configuration.
Fitting Notes
- ECU remap mandatory. Professional tuning essential
- Front-mount intercooler required
- +50% injectors and an upgraded fuel system recommended for 300+ RWHP
- 1KD VNT simulator may be required (sold separately)
- Custom intercooler and intake piping required
- Minor intake, intercooler and coolant-line modifications may be required
- Dump pipe adapter kit available for 3 inch exhaust systems (sold separately)
- Professional installation strongly recommended. Off-road or competition use only. Check local regulations
Recommended Supporting Mods
- Fuel: +50% injectors minimum for 300+ RWHP, high-pressure fuel pump upgrade, rail blank or upgraded relief valve
- Air: front-mount intercooler (required), custom intercooler piping, high-flow intake, 3 inch exhaust (dump adapter available)
- Tuning and monitoring: professional ECU remap (mandatory), boost gauge accurate to 50 PSI, EGT gauge, wideband O2 during tuning
- Additional: VNT simulator (stepper motor delete), dump pipe adapter for 3 inch exhaust, clutch upgrade on manuals
Shipping and Payment
- Free express shipping Australia-wide, tracked.
- Afterpay, Humm, Klarna and Zip available at checkout.
- Returns and warranty are handled under our refund policy.
Frequently Asked Questions
Is this a complete bolt-on kit?
It includes turbo, PPRC high-mount manifold, dump pipe, oil and coolant lines, fittings and hardware. Front-mount intercooler and custom piping are required separately.
What does F55 mean? Is it a 55mm turbo?
No. F55 refers to the turbo frame and flow class, not a single compressor measurement. The Boost X is engineered for real-world flow, efficiency and durability.
Will this work with my factory intercooler?
No. The kit requires a front-mount intercooler and custom intercooler piping.
Do I need a tune?
Yes. A professional ECU remap is mandatory. 45 PSI capability needs expert calibration of fuelling, timing and boost.
What power can I expect?
With +50% injectors, fuel pump, front-mount intercooler, exhaust and appropriate tuning, 300+ RWHP is achievable. Results vary with build quality.
How does this compare to the F66 high-mount kit?
Both are complete high-mount kits capable of 300+ RWHP. The F66 uses a larger 52.5mm compressor and turbine; the F55 Boost X focuses on flow efficiency with its Ultra S-Curve turbine.
What boost should I run?
The kit is 45 PSI capable with 35 PSI recommended for daily boost. Your tuner sets the final target for the complete setup.
Built for Real Performance, Not Marketing Numbers.
Flex F55 Boost X high-mount kit. 300+ RWHP. 45 PSI capable. PPRC stainless manifold. Complete with all lines. Professional build required.
Common Rail Cowboys is not affiliated with Toyota Motor Corporation, Flex Thailand or PPRC. Installation should be carried out by a competent person. Professional ECU tuning and supporting modifications are mandatory. Fitment and compliance are the buyer's responsibility. Turbo modifications may affect vehicle warranty and compliance.
