The Cobb downpipe is available in a "street" version that comes with a single high-flow catalytic converter. AMS PerformanceCat-Back Exhaust System'04-'07 WRX/STIThe AMS Subaru Impreza WRX STI 3 ...

In 2001, Subaru introduced North Americans to the Impreza WRX. It was sold with a 227-horsepower ... to a buddy's shop and purchasing a cat-less downpipe and an exhaust just a few hours later ...

STI: three little letters that herald ... the car may have had at least an aftermarket downpipe. Not that long ago, all Subaru owners tended to wave to each other, just like motorcyclists.

After seeing the first episode, we’d think twice before giving Pastrana a shiny new custom Impreza WRX STI ... rally Subaru. They’ve put in a performance-tuned ECU and custom down pipe ...