I just had a Magnaflow catback installed on my 09 WRX by the fine folks at: http://www.sasperformance.ca
Just wanted to give them the thumbs up. excellent customer service. they charged me $80 for the install.
they are located in Burnaby. They also do suspension, wheels, tires, pretty much everything other than body work.
gonna go back here from now on for my regular maintenance and some suspension work in the future.
Edit: they also posted pics/videos of the install process on their facebook page. good stuff.