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We install and test many of the parts we sell — so you’re getting real-world answers, not guesses.
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FAST WC Performance Exclusive
One package. Three upgrades: a FAST WC Custom OTS Tune, a COBB Accessport V3, and your choice of ETS, AMS, or Perrin intake.
Save $102 compared with buying the intake, COBB Accessport, and tune individually. This is a straightforward way to add horsepower, sharpen response, and improve everyday drivability while keeping dependable performance in focus.
The FAST WC tune was developed specifically for the VB WRX with a 6-speed manual transmission. On a stock WRX using the 91-octane calibration, testing produced 288 WHP and 335 WTQ—gains of +46 WHP and +95 WTQ over the factory calibration. Results with an intake will vary.
Developed by Dave Brown and Ray Arroyo, every FAST WC OTS calibration is tested on the dyno and the road for smooth, predictable power.
Select your intake above: ETS Intake, AMS Intake, or Perrin Intake. The price includes one selected intake, the COBB Accessport V3, and a FAST WC Custom OTS Tune prepared for that intake and your selected fuel type. The package saves you $102 compared with purchasing the three components individually.
Included for loading your FAST WC calibration and monitoring your WRX.
Choose ETS, AMS, or Perrin. The AMS intake shown is an example; the intake shipped will match your selection.
Plus: a FAST WC Custom OTS Tune matched to the intake and fuel option you choose at checkout.
In testing on a stock WRX, the FAST WC 91-octane calibration delivered greater wheel horsepower than the standard COBB OTS map. The figures below are stock-vehicle tune benchmarks, not promised results for every intake selection.

Dyno comparison shown is for the stock-vehicle 91-octane calibration. Results with a selected intake will vary based on fuel quality, conditions, vehicle condition and intake choice.
Drivers can expect a noticeable increase in performance, improved boost response, smoother power delivery and sharper throttle behavior. Actual results may vary from one vehicle to another.
Generic OTS maps must support a broad range of vehicles and operating conditions. The FAST WC tune was developed specifically for the 2022–2026 VB WRX platform to provide a more refined and responsive calibration.
| Feature | Factory Calibration | Standard COBB OTS | FAST WC OTS Tune |
|---|---|---|---|
| Dyno Results | 242 WHP 240 WTQ |
271 WHP 304 WTQ |
288 WHP 335 WTQ |
| Throttle Response | Conservative | Improved | Sharper & More Responsive |
| Power Delivery | Factory Calibration | Improved | Smoother & More Refined |
| Boost Control | Factory Strategy | General OTS Strategy | Optimized Boost Control |
| Developed For | Mass Production | Generic OTS Calibration | Purpose-Built for the 2022–2026 VB WRX |
| Fuel Support | Factory Fuel Mapping | 91 / 93 Octane | 91, 93 & ACN91 Available |
| Rev Limiter | Factory Limit | Map Dependent | 6,400 RPM |
FAST of West Chester has been tuning and servicing performance Subarus for more than a decade. This OTS tune combines the hands-on Subaru experience of the FAST WC team with the tuning expertise of Ray Arroyo, who is highly recommended by WRX owners.


This calibration was developed through the combined experience of Ray Arroyo of TurboTekTuning and Dave Brown of FAST of West Chester—two respected Subaru performance specialists with extensive hands-on knowledge of Subaru tuning and the FA24-powered VB WRX platform.
Ray and Dave worked together to develop and test an OTS calibration that delivers the balance WRX owners are looking for: stronger power, smooth drivability and dependable performance for everyday driving.
Rather than chasing a peak dyno number, the goal was to create a refined calibration that improves throttle response, boost control and power delivery while maintaining the reliability expected from a properly maintained daily-driven WRX.
The result is a tested, proven OTS tune backed by the combined expertise of TurboTekTuning and FAST of West Chester.
This tune is a strong fit for drivers who:
Not compatible with CVT-equipped Subaru WRX models.
Before installing the calibration, update your COBB Accessport to the latest available firmware.
If the Accessport displays a message indicating that the calibration does not match the vehicle's installed firmware, select “Yes” to continue. The Accessport will flash the ECU normally and update the ECU firmware during installation.
Yes. A compatible COBB Accessport V3 is included in this package.
You will receive the ETS, AMS, or Perrin intake you select above. The included calibration is prepared for that intake and your selected fuel type.
No. This is a Custom Off-The-Shelf calibration. Data-log reviews, revisions, map adjustments and fully custom tuning are not included.
Your calibration will be emailed within two business days after FAST WC receives your COBB Accessport serial number.
Only use the calibration with the modifications selected and approved during checkout. Additional performance modifications may require a new calibration or full custom tune.
Yes. FAST WC offers a discounted upgrade to a full custom ProTune when you add modifications that require additional calibration.
This package includes one selected intake, a COBB Accessport V3, and a matching FAST WC Custom OTS calibration file. Installation labor and mechanical diagnostic services are not included.
This is an Off-The-Shelf calibration. No data-log reviews, custom revisions, map adjustments or additional tuning services are included.
Your vehicle must be in good mechanical condition before purchasing or installing this calibration. FAST WC prepares the tune for the intake and fuel selected during checkout.
Vehicles with existing mechanical or electrical problems are not eligible for refunds. FAST WC is not responsible for diagnosing or repairing pre-existing mechanical or electrical issues.

We’re not a warehouse—we’re a performance shop.
Based in West Chester, PA, FAST WC is known for building and tuning real-world performance cars, not just listing parts online.
We sell what we run. Period.
$793.00
I can't recommend this place enough. Being able to trust a shop in the performance world is big. The 2hr drive to get there, is worth knowing the job will be done right. Very happy to have found this shop, to
support my builds going forward.
I recently had the pleasure of working with FAST of West Chester for some performance upgrades on my 2022 WRX, and the experience was nothing short of exceptional. I opted for a Borla S-Type exhaust and Cygnus Coilovers, and the team at FAST nailed the installation, fitment, and setup to a T.
The team at FAST are excellence in every way. First, I consulted with Dave on mods for my HPDE track car. He listened and advised me on the best parts & mods to achieve my goals. He was patient & gave me space to research the options presented & worked with me through several changes before we built. Second, the build execution was flawless, proper heat shielding, bracing and poly everywhere. All components worked as advertised.
This place has been my go to shop for all things Subaru. From simple service to performance parts and tuning, they have been top notch.
Excellent shop. They installed a Cobb Stage 2 DP and Whiteline Sway bars and end links on my 2013 WRX. The work was done right and clean. The estimate was accurate. They were very knowledgeable, friendly and gave me the straight scoop on exactly what I was getting for the money
and what I needed to get where I want to be with it. I'd recommend them
to any car enthusiast.
We install and test many of the parts we sell — so you’re getting real-world answers, not guesses.
Most products we carry include a manufacturer warranty. Since we work with top performance brands, warranty coverage can vary by product. If you have questions about a specific item, reach out — we’re happy to help.
Yes — we don’t just sell parts, we install and tune them too. FAST of West Chester is a real performance shop, and we’ve worked hands-on with many of the products we carry. If you have questions about fitment, installs, or building your setup, our team can point you in the right direction.
Many of our products ship the same day or next business day, depending on availability. We work hard to get parts out fast so you can get your build moving without delays.
Returns for exchange or refund are accepted within 30 days of receiving your order. Items must be in new, unused condition and in original packaging. If you have any questions, our team will help make the process easy.
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Shipped super fast, install went well. The tune is great so far but I’ve only been on one drive. Clutch response seems better and there is definitely more power. Great hearing my BOV with the intake installed.