Borla cat-back exhaust system.

This BORLA® Cat-Back system was designed specifically for the Mustang Dark Horse. Do not use the adapters for full 3” inlets. System contains a Merge X-Pipe for increased performance and improved sound. System has Active Valve Exhaust valves. System features BORLA®'s Polyphonic Exhaust Harmonizer Technology which utilizes patented units that contain pipes of different diameters and lengths to create multiple exhaust notes that harmonize to deliver a clean, rich, full-bodied sound. BORLA® Cat-Back and Axle-Back multi-core technology is designed to unleash hidden horsepower. Increased exhaust velocity adds power, driving excitement, fuel economy, and the distinctive BORLA® Sound of Power respected by motoring enthusiasts everywhere. Ultra-smooth mandrel bends ensure maximum flow & power, and precision computer numerical control (CNC) manufacturing ensures an accurate fit. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.

A cat-back system replaces everything behind the catalytic converter and leaves emissions equipment in place.

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