Cat-Back Exhaust Systems
A cat-back exhaust system can free up power and improve the exhaust note of your Subaru. "Cat-back" stands for "From the catalytic converter back." Cat-back exhaust systems usually extend from about the middle of the car back to the tailpipes. These systems are generally emissions-legal since they do not alter the factory catalytic converter(s). Check and understand your local laws, though!
Invidia N1 Single-Sided Cat-Back Exhaust 2015+ WRX/STI
Invidia's single-muffler N1 cat-back exhaust for 2015+ WRX/STI is designed for lighter weight, higher exhaust flow, and a more assertive tone. All-stainless construction, polished 3" mandrel-bent piping, and flame-treated exhaust...
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