CTS Turbo High-Flow Catalytic Converter – 2013–2016 Ford Focus ST | EcoBoost 2.0T | Downpipe High-Flow Cat

The CTS Turbo High-Flow Catalytic Converter for the 2013–2016 Ford Focus ST is a direct-fit high-flow cat upgrade for the EcoBoost 2.0T-powered Focus ST — replacing the factory catalytic converter with a high-flow unit that significantly reduces exhaust backpressure, improves exhaust flow, and unlocks the performance potential of the Focus ST's EcoBoost 2.0T turbocharger. The factory Focus ST catalytic converter is a significant restriction in the exhaust system — the high-flow cat removes this restriction while retaining a catalytic converter in the exhaust system for reduced emissions compared to a catless downpipe. CTS Turbo is one of the most respected Ford EcoBoost performance brands in the North American aftermarket — known for their downpipes, intakes, intercoolers, and exhaust components for the Focus ST and Fiesta ST platforms.

Key Features:

• High-flow catalytic converter — replaces the factory Focus ST catalytic converter with a high-flow unit — significantly reduced exhaust backpressure and improved exhaust flow compared to the factory cat
• Reduced backpressure — the factory Focus ST cat is a significant exhaust restriction — the CTS Turbo high-flow cat removes this restriction, allowing the EcoBoost 2.0T turbocharger to spool more freely and maintain boost more efficiently
• Retains catalytic converter — unlike a catless downpipe, the high-flow cat retains a catalytic converter in the exhaust system — reduced emissions compared to catless and a more street-appropriate solution for daily-driven Focus STs
• Direct-fit — engineered for direct-fit installation on the 2013–2016 Focus ST — correct flange dimensions and connection points for the Focus ST's exhaust system
• Compatible with CTS Turbo downpipe — designed to work with the CTS Turbo downpipe system for the Focus ST — verify compatibility with your specific exhaust configuration before ordering
• CTS Turbo quality — manufactured by CTS Turbo, one of the most respected Ford EcoBoost performance brands in the North American aftermarket

High-Flow Cat vs. Catless — Which Is Right for You?

• High-Flow Cat (this product): Retains a catalytic converter in the exhaust system — significantly reduced backpressure compared to the factory cat, but with lower emissions than a catless downpipe. The correct choice for daily-driven Focus STs where emissions compliance is a consideration, or for owners who want meaningful exhaust flow improvement without going fully catless. May still trigger a CEL (check engine light) on some vehicles — an O2 sensor spacer or tune may be required.
• Catless Downpipe: Removes the catalytic converter entirely — maximum exhaust flow and minimum backpressure, but significantly higher emissions. Not street legal in most jurisdictions. Correct for dedicated track or competition use.
• Note: This product is intended for off-road or competition use only in jurisdictions where catalytic converter modifications are not permitted. Verify the emissions regulations in your specific jurisdiction before purchasing and installing any exhaust modification.

EcoBoost 2.0T — Why Exhaust Flow Matters:

The Ford Focus ST's EcoBoost 2.0T is a turbocharged engine — and on a turbocharged engine, exhaust backpressure directly affects turbocharger performance. The turbocharger must push exhaust gases through the entire exhaust system — and the factory catalytic converter is one of the most significant restrictions in that system. Reducing backpressure at the cat allows the turbocharger to spool more quickly, maintain boost pressure more efficiently, and deliver power more consistently across the RPM range. The CTS Turbo high-flow cat's reduced restriction is particularly meaningful when combined with other Focus ST performance upgrades — an aftermarket intake, intercooler, and ECU tune — where the factory cat's restriction becomes an increasingly significant bottleneck.

Specifications:

• Brand: CTS Turbo
• Part Number: CTS-EXH-DP-0012-CAT
• Type: High-flow catalytic converter
• Application: 2013–2016 Ford Focus ST — EcoBoost 2.0T

Fitment Information:

• 2013–2016 Ford Focus ST — EcoBoost 2.0T — all trim levels
• Direct-fit — correct flange dimensions and connection points for the Focus ST exhaust system
• Note: A professional tune is strongly recommended after high-flow cat installation to take full advantage of the reduced backpressure and to address any O2 sensor codes. Verify compatibility with your specific exhaust configuration (factory or aftermarket downpipe) before ordering. An O2 sensor spacer may be required to prevent CEL. Professional installation recommended.

What's Included:

• CTS Turbo high-flow catalytic converter — 2013–2016 Ford Focus ST EcoBoost 2.0T (CTS-EXH-DP-0012-CAT)
• All required hardware for installation
• Refer to CTS Turbo's product documentation for complete kit contents

Installation Notes:

• Professional installation by an experienced exhaust specialist recommended — catalytic converter replacement requires correct flange torque, correct O2 sensor installation, and verification of no exhaust leaks before driving
• An O2 sensor spacer may be required to prevent a downstream O2 sensor CEL after installation — verify with your tuner or installer before ordering
• A professional tune is strongly recommended after installation — the reduced backpressure allows the ECU to run more aggressive boost and timing than it would with the factory cat — a tune optimized for the high-flow cat will extract the full performance benefit
• Apply anti-seize compound to all exhaust fasteners — exhaust fasteners are subject to extreme heat cycling and will seize without anti-seize
• Check for exhaust leaks at all flange connections after installation and after the first heat cycle

Why CTS Turbo?

CTS Turbo is one of the most respected Ford EcoBoost performance brands in the North American aftermarket — known for their downpipes, intakes, intercoolers, and exhaust components for the Focus ST, Fiesta ST, and other EcoBoost platforms. CTS Turbo's Focus ST exhaust components are engineered specifically for the EcoBoost 2.0T platform — correct fitment, correct flow characteristics, and correct quality for the specific demands of the Focus ST's turbocharged exhaust system. For Focus ST owners who want a quality high-flow cat from a brand with proven EcoBoost performance credentials, CTS Turbo is the correct choice.

Perfect For:

• 2013–2016 Ford Focus ST EcoBoost 2.0T owners who want to reduce exhaust backpressure and improve exhaust flow with a high-flow catalytic converter upgrade — a meaningful performance improvement over the factory cat while retaining a catalytic converter in the exhaust system
• Focus ST builds where the high-flow cat is part of a complete exhaust system upgrade — paired with a CTS Turbo downpipe, cat-back exhaust, intake, intercooler, and ECU tune for a complete EcoBoost 2.0T performance build
• Daily-driven Focus STs where a catless downpipe is not appropriate and a high-flow cat provides the correct balance of performance improvement and emissions reduction

Note: Intended for off-road or competition use in jurisdictions where catalytic converter modifications are not permitted — verify local emissions regulations before purchasing. O2 sensor spacer may be required. Professional tune strongly recommended after installation. Apply anti-seize to all exhaust fasteners. Check for exhaust leaks after installation.