This MagnaFlow exhaust system is perfect for Subaru Impreza STi owners from 2008 to 2014 who want to enhance their driving experience. Whether you're cruising on the highway or showing off at car meets, it'll make your car sound and perform better. The main piping is 3 inches in diameter, and it has a Quad Split Rear exit with 4 - inch polished tips. It's easy to install at home, so you don't need to take it to a mechanic.