Originally Posted by xluben
All 08+ STI hatch exhausts fit the 2011+ WRX hatch. I have not heard the MadDad. The Q300 drones a lot.
I have to throw in a reminder that all new exhausts will have some sort of break in period.
My Q300 was horrible at first, but has broken in very nicely. I thought I was going to have to get rid of it at first because the drone was terrible, but I no longer get any drone after several thousand miles of driving, and am now quite happy with it. (Other people have verified this, I swear I didn't go deaf)
I have a coworker with the maddad, and it's definitely a good option too. Sounds mostly stock at idle/low rpms but has some bite to it at higher rpms.