Cat Back Exhaust for Ford Fiesta ST (2014-2018) 1.6L

High-Flow Cat-Back Exhaust System for 2014-2018 Ford Fiesta

What it Does: The direct-fit cat-back exhaust system replaces the restrictive factory exhaust assembly on the 2014-2018 Ford Fiesta ST to decrease backpressure, improve post-turbine gas velocity, and drop exhaust gas temperatures.

The Stock Ford Fiesta ST Exhaust Bottleneck

The factory exhaust on the B299 chassis Fiesta ST utilizes narrow-diameter tubing, restrictive crush bends, and a baffled rear silencer. At wide-open throttle or under elevated boost levels, this convoluted routing generates excessive thermal retention and high exhaust backpressure directly downstream of the turbocharger. The resulting backpressure restricts turbine efficiency, elevates exhaust gas temperatures (EGTs), and limits top-end power potential on the direct-injected platform.

The Engineering Solution

Fabricated for the turbocharged 1.6L EcoBoost inline-four, this performance system transitions to large-diameter 3-inch mandrel-bent piping to maintain constant cross-sectional area and eliminate flow turbulence. Built from aluminized 409 stainless steel, the tubing withstands extreme thermal expansion cycles and road spray corrosion. The high-flow straight-through muffler design controls high-frequency rasp while drastically reducing backpressure against the turbine wheel. Featuring pre-welded OEM-style hangers and a polished 3-inch exhaust tip, this unit is engineered for direct bolt-on fitment using existing factory mounting points (MPN: SPT-CAT1107).

Technical Specifications

Compatibility

• 2014 Ford Fiesta ST 1.6L Turbocharged Hatchback
• 2015 Ford Fiesta ST 1.6L Turbocharged Hatchback
• 2016 Ford Fiesta ST 1.6L Turbocharged Hatchback
• 2017 Ford Fiesta ST 1.6L Turbocharged Hatchback
• 2018 Ford Fiesta ST 1.6L Turbocharged Hatchback

Frequently Asked Questions

Does this fit the B299 Fiesta?
Yes, this is a direct fit for the 2014-2018 Ford Fiesta ST equipped with the 1.6L EcoBoost engine.

Will installing this cat-back exhaust trigger a Check Engine Light (CEL)?
No, because this system bolts downstream of the factory catalytic converter and primary oxygen sensors, it does not alter emissions monitoring circuits or trigger a CEL.

The Ford EcoBoost Standard

Ford's EcoBoost hot-hatch architecture thrives when exhaust gases can scavenge efficiently out of the turbine housing. This cat-back configuration delivers a crisp exhaust note and maximum thermal flow, ensuring your Fiesta handles aggressive road and track demands with uncompromising reliability.