I bought my first 2012 wrx hatch in wrb and currently have a Cobb AP, Turbo XS BOV, and an AEM CAI, stock exhaust.... It is tuned with the Cobb stage 1 93 octane+aem...
I am looking to go stage 2. What is the procces? What will have to be installed other than a down pipe and could I do it myself? And how much power will I suspect to gain... Any recommended downpipes?
Will the stock exhaust sounds louder with a down pipe?