Armytrix Ford Focus RS (MKIII) 2.3L Turbo (2016-2018) valvetronic exhaust system
Unlock the full performance and rally-inspired soundtrack of your Ford Focus RS MK3 with the ARMYTRIX Valvetronic Exhaust System, purpose-built for the 2016–2018 2.3L Turbocharged hatchback. Whether you’re pushing through corners or commuting through the city, this system gives you total control over your exhaust tone and flow—thanks to full wireless valve control via OBDII.
Crafted from high-grade stainless steel with 3” main pipes and aggressive dual 4.5” tips, this is a full-performance system designed to deliver sharper throttle response, louder pops and bangs, and a truly addictive driving experience.
Fitment:
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Model: Ford Focus RS (MKIII)
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Years: 2016–2018
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Engine: 2.3L Turbocharged Inline-4
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Drive Orientation: Left-Hand Drive & Right-Hand Drive Compatible
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Control Module: ARMYTRIX OBDII Required
Key Features:
Valvetronic Control via OBDII (Remote + App):
Switch between stealth and full-throttle sound profiles instantly with the included wireless remote or ARMYTRIX smartphone app—all connected via your car’s OBDII port. No hard wiring. No cabin switches.
3” Mandrel-Bent Stainless Steel Construction:
High-flow 3-inch main pipes improve turbo response, lower backpressure, and enhance exhaust tone at every RPM.
Dual 4.5” Exhaust Tips – Aggressive Rally-Inspired Look:
Oversized dual 4.5” tips deliver a bold, motorsport-grade appearance and a commanding finish out back.
Fault Code Suppression System:
ARMYTRIX’s proprietary catalytic converter and OPF-related fault-code clearing mechanism helps prevent Check Engine Lights (CEL) when upgrading from stock components.
System Compatibility & Notes:
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Full System Requires Link Pipe
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Cat-Back System fits directly to the OEM catalytic converter using the ARMYTRIX link pipe
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ARMYTRIX Down Pipe is not compatible with the OEM cat-back—must be installed with the ARMYTRIX Cat-Back System
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Direct Bolt-On Installation – No welding or fabrication required
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Plug-n-Play OBDII Module – Reduces installation time by up to 30%
Valvetronic Sound Modes (Remote + App Controlled):
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Quiet Mode (Valves Closed) – Milder tone for city or daily use
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Race Mode (Valves Open) – Aggressive turbo pops and full-volume growl
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Auto Mode – App-based dynamic valve modulation based on driving behavior
What’s Included:
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ARMYTRIX Valvetronic Cat-Back Exhaust System (3")
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Dual 4.5” Exhaust Tips (Finish Options Available)
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OBDII Plug-n-Play Wireless Control Module
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Wireless Remote Controller
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Complete Mounting Hardware & Link Pipe (if purchasing full system)
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Digital Installation Instructions
Important Notes:
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OBDII Control Module Required for full valve control functionality
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ARMYTRIX Down Pipe must be paired with ARMYTRIX Cat-Back
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Link Pipe required for connecting to stock catalytic converter
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Designed for LHD and RHD Focus RS MK3 models
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Professional installation highly recommended
SEO Keywords / Tags:
Ford Focus RS MK3 Exhaust, Armytrix Focus RS Exhaust System, 2.3L Turbo Exhaust Upgrade, Focus RS Valvetronic Exhaust, Armytrix Wireless Valve Exhaust, Focus RS Cat-Back System, Focus RS Dual 4.5” Tips, Armytrix OBDII Exhaust Control, Focus RS Check Engine Light Fix, Plug-n-Play Exhaust Focus RS
Aggressive Looks. Intelligent Control. Rally-Bred Performance.
Transform your Focus RS into a street-legal track weapon with the ARMYTRIX Valvetronic Exhaust System—engineered for thrill-seekers who crave control, volume, and velocity.
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T&C's
T&C's
All purchases on this website our subject to our Terms and Conditions. Please ensure you have read and understood these before making a purchase. If you have any questions, please feel free to contact us and we will endeavour to answer any questions you may have.
PLEASE BE AWARE: Sports cats can NOT legally be installed on a vehicle for use on a public road that was manufactured after 1st March 2001 unless type ECE 103R approved - this can be identified in either the product description and/or in the Technical Information section listed. If you have any doubt on this approval, please contact us immediately for confirmation. Fitting a De-Cat/Cat Bypass, DPF delete/bypass or GPF delete/bypass to a vehicle that is to be used on UK roads will cause the vehicle to fail the MOT emissions test, therefore rendering it unroadworthy and illegal to be used on the road. Therefore, any such products are strictly sold as off-road or motorsport use only and NOT for road use. The vehicle should be transported from place to place via a trailer, flatbed or other recovery means.
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Stock Availability
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Please Note:
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Email: Store@avontuning.co.uk
Phone: 01454 800 117
Online we currently accept payment from the methods listed above including a wide range of finance options.
Finance Options
In order to get the kit you want, when you need it, without ruining the family finances we offer a highly flexible range of finance options to help you get the best products on your vehicle now rather than at the end of the season when you've saved up the cash to make the purchase. There are even interest free options which effectively spread the cost without costing you any extra.
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What Our Customers Are Saying
Mark W.
“Thanks to James and Marcus at Avon Tuning for arranging and fitting a Quicksilver exhaust to my new Defender V8. Everything went like clockwork and it sounds awesome”
Paris C.
"Would highly recommend Avon Tuning. They're extremely knowledgeable, outstanding customer service - we even had a lovely courtesy car for the few hours they had ours. You're in good hands with Avon Tuning!"
Richard N.
"I’d give 6 stars if they’d let me! Avon Tuning did the most fantastic job. I arranged everything with James at the beginning and he was so helpful, guiding me to the correct exhaust system (Miltek) and a Stage 1 Remap"
Peter B.
"Amazing service from James and the team at Avon Tuning.Fitted a new exhaust system on my Aston Martin Vantage, not only does it sound and look great but it puts smiles per miles for me."
