Cobb 14-19 Ford Fiesta ST 2.5in. Cat-Back Exhaust System

The 2.5-inch diameter tubing on this COBB cat-back exhaust system is a key design choice for the 2014-2019 Ford Fiesta ST. This larger diameter allows exhaust gases to flow more freely than the stock system, which can help your engine breathe better. It’s made from 304 stainless steel, a material known for its strength and resistance to corrosion, meaning this exhaust should hold up well over time, even in varied weather conditions.

This system replaces the factory muffler and exhaust piping from the catalytic converter back. The goal here is to reduce backpressure and give your Fiesta ST a more aggressive, sportier exhaust note. You'll notice a deeper tone, especially when you get on the throttle. COBB designed this to be a direct bolt-on replacement, so installation should be straightforward without needing any welding or cutting, assuming your existing exhaust hangers are in good shape.

When installing, it's always a good idea to have some penetrating oil on hand for the factory exhaust bolts, as they can sometimes be stubborn. This cat-back system is designed to work with the stock catalytic converter, making it a popular choice for those looking to improve their car's sound and performance without getting into more complex modifications. You'll get the exhaust system itself, and typically all the necessary hangers and clamps for a complete installation.