What's the difference between RZ Stage 1 and RZ Stage 2?

RZ Stage 1 is a tune only. Software optimisation with no hardware changes. RZ Stage 2 adds bolt-on performance parts (intake, intercooler, j-pipe) that free up airflow and cooling, allowing for significantly more gains with a custom tune.

Do I need RZ Stage 1 first?

No. RZ Stage 2 includes everything from RZ Stage 1 (Cobb Accessport, custom tune) plus all the hardware. You can go straight to RZ Stage 2.

Why these specific parts?

Process West designs and builds for Subaru in Australia. Their intake and top-mount intercooler are the parts that consistently deliver on the FA24 turbo. Pair them with the Invidia catted j-pipe and the airflow side is properly sorted.

Will the high flow cat trigger a check engine light?

No. We calibrate the O2 sensors in the tune so it doesn't throw a code.

How long will my car be with you?

2-3 days. Day 1 is inspection and install. Day 2-3 is dyno tuning, road tune, and validation runs.

FA24 TURBO

Subaru WRX VB (2022+) RZ Stage 2

Full bolt-on package with custom dyno tune. Intake, intercooler, and j-pipe.

+30kW Power

+60Nm Torque

Get a Quote What's Included

$7,099 Installed, inc. GST

Process West Cold Air Intake
Process West Intercooler
Invidia J-Pipe w/ High Flow Cat
Custom Dyno Tune with Cobb Accessport

Parts & labour: Included
Cobb Accessport: Included
Turnaround: 2-3 days

The Package

What's included

Parts, labour, and dyno tune. All listed below. No surprise add-ons.

Intake

Process West Cold Air Intake

Australian-designed intake for the FA24 turbo. Smooth mandrel bends, sealed airbox. Clean air to the turbo without restriction.

Exhaust

Invidia J-Pipe w/ High Flow Cat

High-flow catted j-pipe replacing the restrictive factory unit. Single biggest bolt-on for exhaust flow on the FA24 turbo.

Cooling

Process West Intercooler

Top-mount intercooler upgrade. Bigger core, less heat soak. Critical when the factory unit is sitting right above the engine.

Tuning

Cobb Accessport + Custom Dyno & Road Tune

Cobb Accessport included. Custom map built from scratch for your hardware, live tuning session, then road tuning to lock it in.

The Process

How it works

01
Get in touch

Fill out the enquiry form with your vehicle details, current setup, and what you're after. The more detail the better. It helps us prepare the right plan for your car.
02
Plan & book

We'll get back to you, answer questions, and confirm the package is right for your car. Once it's locked in we take a deposit and organise a drop-off date.
03
Install, tune & handover

Your car comes in, parts go on, and it goes straight onto the dyno for a custom tune built from scratch. We road test, verify everything, and hand it back with dyno sheets.

FAQ

Common questions

What's the difference between RZ Stage 1 and RZ Stage 2?: RZ Stage 1 is a tune only. Software optimisation with no hardware changes. RZ Stage 2 adds bolt-on performance parts (intake, intercooler, j-pipe) that free up airflow and cooling, allowing for significantly more gains with a custom tune.
Do I need RZ Stage 1 first?: No. RZ Stage 2 includes everything from RZ Stage 1 (Cobb Accessport, custom tune) plus all the hardware. You can go straight to RZ Stage 2.
Why these specific parts?: Process West designs and builds for Subaru in Australia. Their intake and top-mount intercooler are the parts that consistently deliver on the FA24 turbo. Pair them with the Invidia catted j-pipe and the airflow side is properly sorted.
Will the high flow cat trigger a check engine light?: No. We calibrate the O2 sensors in the tune so it doesn't throw a code.
How long will my car be with you?: 2-3 days. Day 1 is inspection and install. Day 2-3 is dyno tuning, road tune, and validation runs.