The COBB Ford Focus ST SS 3in Catback Exhaust is designed for the verified vehicle applications listed below. Match manufacturer part number 591100, complete year, make, model, application, engine and transmission configuration, required calibration, emissions eligibility, interfaces, and every product note before ordering.

Key Features

• T304L Stainless Steel Construction: Full 3″ mandrel-bent tubing resists corrosion and ensures long-lasting durability under high heat.
• Vibrant Performance Muffler: High-flow internal design reduces backpressure while refining sound to a sporty growl.
• Bolt-On Installation: Uses factory mounting points and hangers for precise fit with no fabrication needed; part number 591100.
• X-Pipe Over-Axle Design: Promotes smooth exhaust scavenging for better mid-range power and eliminates resonance or drone at highway speeds.
• Polished 4″ Slash-Cut Tips: Dual 4.0″ OD tips add a custom look and amplify exhaust note without excessive volume.
• dyno-tested gains of +10 whp and +12 ft-lbs torque on stock tune.

Fitment

Specifications

What’s Included

One new COBB product in the exact configuration and quantity identified by manufacturer part number 591100. Calibrations, hardware, hoses, clamps, gaskets, adapters, wiring, fluids, tools, and companion components are included only when expressly stated for this exact part number.

About COBB

COBB develops engine-management, intake, cooling, exhaust, drivetrain, suspension, and vehicle-accessory products for supported performance platforms. Correct selection remains exact-vehicle, exact-configuration, exact-interface, and exact-part-number specific.

Related COBB Products

• Cobb 16-18 Ford Focus RS SS 3in Catback Exhaust
• Cobb 10-12 Mazdaspeed3 Gen2 SS 3in Cat-Back Exhaust
• Cobb 11-14 Subaru WRX Hatch / 08-14 STi Hatch 3in Catback Exhaust

Browse the COBB collection for related tuning, intake, cooling, exhaust, drivetrain, and chassis products.

Frequently Asked Questions

Will this COBB product fit my 2013-2015 Ford Focus ST?
That application is listed, but confirm the exact part number, engine and transmission configuration, factory equipment, required calibration, emissions eligibility, and every manufacturer note before ordering.

Are all supporting parts included?
Only components expressly listed for the exact manufacturer part number are included. Tuning, hardware, hoses, clamps, gaskets, adapters, wiring, fluids, and companion components may be separate.

Is tuning or calibration required after installation?
Requirements depend on the exact product and vehicle. Intake, fuel, boost, turbo, and engine-management changes may require a compatible calibration before operation.

Installation Instructions

Follow the current COBB and factory service instructions for this exact part number. Verify fitment, factory equipment, emissions eligibility, required calibration, software and firmware, interfaces, hardware, fluid or electrical connections, and clearances before installation. Inspect the completed work and confirm safe operation before full-load use.