The AVO Down Pipe (Front Pipe) is constructed from stainless steel, enduring longevity. It also features a divorced waste gate dump tube, removing a major bottleneck present on the factory exhaust system. The stock exhaust flange simply has a blank plate at that point, putting a major lid on performance.
Your stock down pipe also uses one or two fairly restrictive catalytic converter(s). The AVO front pipe addresses this issue with a single high-flow sports catalytic converter.
All this adds up to a huge decrease in back pressure and a big increase in performance. Use your turbo to it's full potential!
High-Flow Metal Catalytic Converter
Stainless Steel Construction
Impreza WRX: 2001-2007 [turbocharged]
Forester XT: 2004-2008 [turbocharged]