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Dual Fuel Rail Billet Tumbler Delete Kit - Subaru 01-07 WRX/STI & 08-21 STI
$1,445.00 AUD
Unit price perPay with
This bolt-on, integrated performance upgrade simultaneously solves the two most significant bottlenecks in the EJ-series intake system: air restriction and fuel supply.
This Dual Fuel Rail Tumbler Delete Kit, CNC machined from billet aluminium, replaces the restrictive factory assembly with precision-machined billet components, providing maximum airflow and guaranteed fuel delivery for high-boost applications.
Billet Tumbler Delete
The factory Tumble Generator Valves (TGV, often referred to as tumblers) use butterfly valves in the intake runners that create severe restriction, especially at mid to high RPMs.
Our Billet Tumbler Delete Kit eliminates this bottleneck entirely.
Unrestricted Performance
CNC machined from Billet Aluminum to create a high-flow, smooth internal runner.
Significant Power Gains
By smoothing the path of air into the cylinder heads, you remove a major choke point, resulting in measurable increases in horsepower and torque across the entire rev range.
Precision Design
Features a smooth, radiused inlet and outlet profile, ensuring maximum laminar flow into the cylinder head ports.
Dual Fuel Rails
For serious power builders utilising upgraded turbos, injectors, and E85 or race fuels, the factory single-feed fuel system is inadequate. Our integrated Dual Fuel Rails solve fueling inconsistencies under high load:
Consistent Fuel Pressure
The dual-rail design supports larger injectors and provides a reliable, uninterrupted flow of fuel, preventing fuel starvation issues common in highly tuned applications.
High-Volume Ready
Essential for high-horsepower builds, ensuring your engine receives the precise volume of fuel required when running increased boost or alternative fuels (E85).
Integrated Design
Seamlessly engineered into the TGV Delete assembly, reducing complexity and potential failure points compared to separate rail and spacer kits.
Vehicle Compatibility
Subaru WRX & STI (EJ20/EJ25) 2001–2007 (GD Chassis)
Subaru STI (EJ25) 2008–2021 (GR/GV/VA Chassis)
$1,445.00 AUD
Unit price perIn Pursuit of Something More.
There’s more power in that engine, but your stock intake is suffocating it. Our intake lets it breathe.
Ground-Up Performance Engineering.
Our designs all follow a similar path. We remove the stock intake manifold and 3D scan the engine bay to determine the precise constraints of the available space. Once we know what we’re working with, we generate functional renders and finalise form, function, and fitment.
Following our digital models, we generate 3D printed prototypes for further, real-world confirmation of size, fitment, and installation ease. When our prototype is perfect, it's on to manufacturing.
Proudly Built Down Under.
All our products are built in-house at our Australian facility. From billet aluminium CNC machining, welding, powder coating and packaging.
Tested & Independently Verified.
We take our product testing one step further. Every new Intake Manifold is sent to specialist tuners who confirm installation ease, power gains, and reliability.
Preferred By Record Holders.
You’ll find Process West in some of the quickest and fastest builds in the world, driven by those who only care about one thing. Results.
Pioneers Since 2003.
Process West is built on continuous innovation. We’ve been building Intake Manifolds and innovating airflow dynamics for over 20 years. Every intake we develop is designed to set new performance benchmarks in turbocharged builds.
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20 Warehouse Place, Berkeley NSW, 2506. Australia.
02 4272 8088
sales@processwest.com.au
20 Warehouse Place, Berkeley NSW, 2506. Australia.
02 4272 8088
sales@processwest.com.au