i remember when i ran straight pipes. I had cut the resonator out of the stock mid and i ran no mufflers for a few days. My god...it was unreal.
Talk to Steve (05legacygt i think)... He has the same setup you have. Stock mid/y with magnaflow 14" mufflers. When he cut out the resonator it sounded PERFECT!!! It isnt too loud and no drone but when he guns it, sounds awesome. I am starting to become a fan of smaller piping for sound reasons. I think I am going to replace my 3" mid (with resonator) for a 2.5" with no resonator. Should be louder and less drone.
Look at CBE's. The HKS and Borla use smaller pipe and drone less than the 3" varieties... Magnaflow, XO2, Perrin, Cobb. I may loose a few horses but brutal sound is brutal sound!