So I've been thinking about getting an exhaust for my 2012 wrx hatch. I've always gone to this awesome muffler place here in the Miami. I was thinking about doing 3" piping from the catback and then having them install a magnaflow muffler. I'm keeping the stock tips. Now I know I won't be getting much with regards to performance but I just want to enhance that subie rumble. I also have the AP3 with cobb intake and box. What do you guys think of this setup and will I need to change the map with the exhaust? Right now I'm running stage 1 sf cobb intake.