Subaru WRX STI (2011–2020) 3” Race Cat-Back Exhaust System – XFORCE

Maximum Volume. Minimum Drone. Pure EJ Boxer Character.

If you want your WRX STI to sound the way Subaru intended, the XFORCE Race Cat-Back System delivers the perfect blend of aggression, flow and tone. Designed for drivers who want a louder, sharper exhaust note without the unbearable drone, this system transforms the STI into a properly exciting road car while keeping cabin refinement in check.

Built from 304-grade stainless steel with smooth mandrel bends and precision TIG welds, the Race System maximises exhaust flow and unlocks improved throttle response, horsepower and torque. The combination of a 3” centre section splitting into twin 2.5” outlets, high-flow resonators and a dedicated drone-control canister creates a powerful, unmistakable Subaru soundtrack — without turning motorway cruising into a headache.

Aggressive, responsive and engineered to fit directly to the factory system, this is the ideal upgrade for any EJ-powered WRX STI owner who wants the full XFORCE experience.

Key Features

• 304 Stainless Steel Construction – long-lasting, corrosion-resistant, and built for performance
• 3” Centre Section → Twin 2.5” Split for optimal flow
• Centre hot-dog resonator for improved tone
• Quad rear mufflers delivering the highest volume in the XFORCE STI range
• Drone control canister to keep interior resonance under control
• Quad 3.5” double-walled tips – bold, premium finish
• Aggressive race-inspired sound without harsh cabin drone
• Direct bolt-on fitment with all hardware included

What to Expect

• Sharper throttle response
• Stronger mid-range torque
• A deep, powerful EJ rumble
• A high-volume exhaust note designed to stand out
• Cabin comfort maintained thanks to drone-management design

This is the loudest STI system XFORCE offers — perfect for drivers who want presence without sacrificing drivability.

Fitment

Designed specifically for the EJ-powered models we received in the UK:

• Subaru WRX STI Saloon (G3) – 2011–2020
  (Including standard and special edition models)

Also fits international WRX models, but UK-market fitment is STI only.