Impreza STi 2008+... 
Turbo-back System (STi 2008+)
- 3” straight-through design through-out;
- Wide-open bell mouth dump-pipe;
- Option 1: Without cat;
- Option 2: With hi-flow metallic cat (pre-cat), O2 sensor after pre-cat;
- 3” hi-flow metallic racing cat;
- Hot-dog center resonator;
- large oval rear muffler;
- Quad 3.5” double-wall, angle-cut tips;
*For some model cars, the CEL(check engine light) might be on after installation of dump-pipe and hi-flow racing cats due to the change of exhaust conditions. ECU tuning is recommended, please consult with professional performance tuning specialist regarding this matter.
Disclaimer
Demo Video for STi 2008+ Turbo-back Exhaust
