FORD FOCUS ST 12-15 DownPipe

Part No. A904


Sub-compact enthusiasts agree … the Ford Focus ST has all the bells and whistles. Its turbocharged 2.0 liter four cylinder engine and six speed manual transmission make this car a must-have in the Thermal R&D exhaust line. Having become a household name in the sub-compact market, we knew we had to pull out all the stops for a car that is worthy of next level exhaust engineering.

Starting with performance, a true 3” diameter exhaust made the most sense. Thermal R&D began at the downpipe, realizing the enthusiast would one day require the full turbo-back kit. After including a resonator in the mid-pipe, we added an external Helmholtz resonator to cancel specific frequencies – namely drone at cruising speeds. We rounded out the system with a unique tip that fit the OEM valance perfectly and completed an exhaust package that any owner would be proud to showcase!


  • True 3” Dia. T304 Stainless Steel downpipe with Catalytic Converter
  • A904 designed to mate with B904-C904 Catback Exhaust for True 3” System
  • Installs using OEM Hangers

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Thermal R&D Part A904

Thermal R&D Part B904-C904