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Mountune B3 Package - Ford Focus RS - Includes COBB Accessport V3

Focus Rs Cobb V3 Accessport B3 Package - Ford Focus RS Power & Performance Upgrade | Mountune

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Availability: Usually Ships in 1 to 2 Business Days
Product Code: AP3-FOR-004B3

Select the Following Corresponding to Your Vehicle

Vehicle Type*:
Focus RS 2016
Focus RS 2017
Focus RS 2018

Intercooler Type*:
Stock original

Fuel Octane / Type*:
91 Octane
93 Octane


COBB Accessport V3 ECU Flasher Ford Focus RS 2016-2018 B3 Package


Ford Focus RS B3 Package

  • COBB Accessport V3
  • mountune Optimized Calibration
  • mountune High Flow Air Filter
  • mountune High Flow Intake
  • mountune Uprated Air Recirculation Valve
  • mountune Roll Restrictor

The mountune Focus RS B upgrade package includes the very best components to enhance and optimize the performance of your Focus RS including custom ECU calibration to optimize the performance of your car based on your specific use and build specification. mountune performance calibrations are proven to extract the maximum reliable performance and the mountune B series upgrade packages bring together the essential pieces to get you going.

Mountune Optimized Calibration (Tuning)

We rely on the industry’s best tuning/flashing device, the COBB Accessport, to deliver our proven ECU calibrations. The Accessport coupled with mountune’s custom performance calibration unlocks power hidden within the factory ECU calibration by replacing conservative factory settings with more aggressive calibrations. The COBB Accessport from Mountune USA includes all of the standard COBB OTS (off the shelf) calibrations along with a custom Mountune calibration built to your specifications based on your modifications, octane, and preferences. The results are impressive gains in torque and horsepower with incredible custom features that can be adjusted to meet your requirements. Our team has spent countless hours on the dyno and track developing performance upgrades that perform in a wide range of applications. With over 30 years of Ford 4 cylinder ECU calibration experience, it's no surprise that Mountune USA are partners with Team O'Neil Motorsports, LaRoza Racing, and O.D.D. Racing. And with multiple Rally America Championships won using Mountune USA custom calibrations, our programming team has more Focus RS tuning experience than any other source available to you. Choose from one of the many upgrade packages to enhance your Focus RS. The Accessport from Mountune is not locked and can be further adjusted at any time.

Mountune Performance calibration slot assignments

The mountune calibrations include 4 slots that are switchable at any time, on the fly, by simply pushing a few buttons. This is a very convenient feature that can be further adjusted in many cases. The default settings for the Focus RS are laid out as such:

Slot 1 - Standard high performance calibration
Slot 2 - Standard high performance calibration with indicated Launch Control and Flat Foot Shifting
Slot 3 - Low boost performance calibration
Slot 4 - Same as Slot 1 with LESS spark (aka panic mode / bad fuel mode

**Launch control & flat foot shifting can be adjusted anytime via the Accessport. By default launch control is set at 5250 RPM and flat foot shifting is set at 5000 RPM.

Ford Focus RS with mountune High Flow Induction Kit. Green dyno run has aforementioned parts installed with stock ECU calibration. Red dyno run has aforementioned parts installed with mountune USA custom calibration.


This part has been designed and is intended for off-highway application only. Installation of this part on a vehicle that is driven on public roads may violate U.S. and Canadian laws and regulations relating to emission requirements and motor vehicle safety standards. Click Here for Emissions compliance information.

Read about the Focus RS tuner B3 Package on Jalopnik.
Mountune ECU calibration and hard parts reviewed
Mountune powered Team O'Neil Focus RS Mt. Washington Hillclimb
The Smoking Tire takes Mountune equipped Focus RS on the track

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Average Rating: Average Rating: 4.5 of 5 4.5 of 5 Total Reviews: 18 Write a review »

  0 of 0 people found the following review helpful:
5 of 5 May 27, 2020
Reviewer: Sean Leonhard from Fairbanks, AK United States  

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  0 of 0 people found the following review helpful:
5 of 5 Get your AP from Mountune August 6, 2019
Reviewer: Taylor Pujals from Long Beach, NY  
Started off my RS with the B3 package from Mountune, and purchased my tune from stratified.
Previously being a stratified fan for my Fiesta ST, I knew their RS tune would be a linear, safe, stronger-then-stock map, which it certainly is. However, it died quickly upstairs and I didn't like the way 1st gear aggressively pulled.
Since Mountune's B3 pack came with a calibration, I worked with Randy to dial in his 91&93 pump tune. Immediately the ignition timings were cleaner, fuel efficiency was +1 mpg, the power band pulled further. It felt healthier, like the car was breathing better. I was convinced by Randy to go one step further for E40, which I'm running today. TLDR: If you have access to E85 and mixing at the pump doesn't bother you, I strongly recommend working with Randy Robles towards E30 or E40 options.

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  0 of 0 people found the following review helpful:
5 of 5 Exactly what I was looking for and more... July 30, 2019
Reviewer: Nick Brownfield from Warrensburg, IL United States  
I decided to pull the trigger and go with this B3 package (and a few other goodies) from Mountune. I could NOT have been more impressed with this kit. The production of each part was top notch. Fitment could not have been better, either. Also, the e-tuning with Randy was super easy and haven't had a single issue on this car which is my daily driver. Randy and every body else with Mountune were able to answer every one of my questions and helped sort out what I needed when I ran into a snag. I highly recommend this kit if you want more for your RS.

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  0 of 0 people found the following review helpful:
2 of 5 Still waiting November 28, 2018
Reviewer: Eric Przyuski from Chino, CA United States  
Bought this product expecting a full package. Only received the motor mount, air filter, recirculation valve, and lower intake hose with clamps. Still have not received the intake duct, upper intake hose or clamps, mountune badge, and even the v3 accessport. Been a couple weeks now with missing products. Should have shipped everything together at the same time.

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  0 of 0 people found the following review helpful:
5 of 5 B3 Package Review November 21, 2018
Reviewer: Peter Herbein from Wyomissing, PA United States  
Great upgrade! Easy to install. Wakes up the car big time! 28lbs of boost all day! Have fun. The V3 is very fun and gives you tons of feedback from the motor. I'm on 93 octane fuel.

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