2014-2019 Ford Fiesta ST - Catback Exhaust

2014–2019 Ford Fiesta ST 3" Catback Exhaust System

The Ford Fiesta ST is one of the most rewarding hot hatches ever sold in North America — a turbocharged, driver-focused machine that punches well above its displacement. This 3" catback exhaust system is built to honor that engineering. More flow, a deeper and more aggressive exhaust character, and the daily drivability that makes a performance exhaust worth living with long-term.

While the competition bolts on 2.25" and 2.5" systems and calls it done, this system runs a full 3" diameter from the catalytic converter back — the largest pipe diameter available for the Fiesta ST platform. That means more room for the 1.6L EcoBoost to breathe, less restriction under load, and a fuller, more authoritative exhaust tone that smaller-diameter systems physically cannot replicate.

Sound management on a 3" system takes real engineering. That's where True Helmholtz Technology comes in. Rather than stuffing a single muffler in-line and hoping for the best, this system uses a straight-through mid-pipe resonator paired with a dedicated rear resonator — a dual-stage approach that eliminates the resonance and drone that plague oversized-tube setups on small turbocharged platforms. The result is a tone with genuine character under throttle and zero fatigue at highway cruise. Not a compromise. An engineering decision.

Constructed from mandrel-bent T304 stainless steel throughout, this system delivers the corrosion resistance and structural integrity that budget systems built from 409 stainless or aluminized steel simply can't match over time. Mandrel bending keeps tube diameter consistent through every curve — no pinched sections, no turbulence, no flow restrictions. Out back, dual polished 2.5" angle-cut tips are sized and positioned to fit cleanly within the OEM rear valance without modification — a fitment detail that competitors have publicly struggled to get right on this platform.

The system mounts directly to the OEM catalytic converter and uses factory hanger locations for a clean, direct bolt-on installation. No cutting, no welding, no fabrication. Just a straightforward upgrade that transforms the way the Fiesta ST sounds and breathes.

• Fits 2014–2019 Ford Fiesta ST (1.6L EcoBoost)
• Full 3" mandrel-bent T304 stainless steel catback system
• True Helmholtz Technology — straight-through mid-pipe resonator + rear resonator for engineered drone elimination
• Largest diameter catback available for the Fiesta ST platform
• Dual polished 2.5" angle-cut tips — designed to fit OEM rear valance
• Mounts directly to OEM catalytic converter
• Direct bolt-on using factory hanger locations
• No cutting or welding required
• Mill finish tubing and resonator / polished muffler and tips
• Limited Lifetime Manufacturer's Warranty

Sound Clip: