Stealth 3-Inch Cat-Back Exhaust System

Introducing the FSWERKS Stealth Exhaust system, engineered for the Ford Focus ST EcoBoost (2013-2018). This cat-back system is constructed from 3-inch diameter mandrel-bent T304 stainless steel tubing, designed to maximize flow and support over 500 wheel horsepower. The heart of the system is a 24-inch stainless steel high-flow, straight-through muffler, delivering a deep, resonant sound at idle and during normal driving, which wakes up to an aggressive tone at high output without being excessively loud. The exhaust is finished with polished dual-wall, 4-inch angle-cut T304 stainless steel tips for an aggressive aesthetic. Construction utilizes precision Tig and Mig welds, with laser-cut T304 stainless steel flanges and solid bar hanger rods for durability. It weighs approximately 40 lbs, a slight reduction from the stock OEM system's ~45 lbs. FSWERKS backs this system with a 5-year limited warranty. This exhaust system is CARB legal and retains all factory emissions equipment. It is specifically designed to fit the Ford Focus ST 2.0L EcoBoost Hatchback models from 2013 to 2018. While generally praised for its fit and finish, one user noted that the fitment was poor on a system with more sections to align compared to the FSWERKS design. Another user mentioned that while the system is quiet during normal driving, a low-frequency drone can develop under load when climbing a hill without downshifting, which can be mitigated by downshifting.