|  |  Rear-Section or Cat-Back Exhaust
The stock exhaust system uses small-diameter tubing and a fairly restrictive muffler in the effort to combat noise. We hard-core performance buffs actually like that trademark Subaru boxer motor exhaust thump, so it's an added bonus when you can bolt on 10 horsepower and get a nicer sound at the same time.
The exhaust system is built in multiple sections. The smallest section you can replace extends from about the rear axle to the outlet. (TurboXS makes systems like this for the 2002-07 cars.) You can also get "cat-back" systems, which add a rear-mid pipe to extend all the way to the rear catalytic converter. A TurboXS cat-back system for the 2008+ WRX sedan is pictured above.
Next: Downpipe & Catalytic Converter
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