GrimmSpeed Cat Back Exhaust System

2015-2021 Subaru WRX / STI

Ships for free in the 48 states

SKU: 070033

Out of Stock

The Cat-Back Exhaust System will come in the resonated version to improve the power on the Subaru WRX/STI Sedan. 


GrimmSpeed Resonated Cat-Back Exhaust System 2011-2015 Subaru WRX/STI


  • Resonated version (quieter when compared to non-resonated)
  • Custom dual-outlet mufflers 
  • Quad 3.5" double-wall angle-cut tips
  • 304 stainless steel construction
  • 1/2" thick-cut flanges
  • Designed with a flex section
  • Includes custom polyurethane hangers to reduce movement and to keep your exhaust in place
  • TIG-welded
  • Provides an aggressive exhaust note
  • 3" piping diameter frees up the flow path to reduce spool while increasing power and torque
  • For sedan models only

GrimmSpeed Cat-Back Exhaust System

The GrimmSpeed Cat-Back Exhaust System is pure stainless steel art that combines a larger piping diameter along with smooth bends to create more horsepower, more torque, all while reducing the turbo lag. This design allows for an unobstructed exit path for the exhaust gases to escape while generating a more aggressive signature Subaru exhaust note. 

This exhaust system features quad polished tips and has a built-in resonator in the piping for those of you who want a more respectful noise level, and it can be employed on a full-blown race car, rally car, or daily-driven street car. Note that this particular exhaust has been made to fit the WRX/STI Sedan models only. 


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