Either Flowmasters or Magnaflows

 

flowmasters are graded in volume levels by the series number. 40 being loudest with audible droning inside the car on most apps down low in the tq/hp curve while 70 series are very quiet although 40, 44 or 50 series would be your choices for your app. none of them will get you a ticket for volume. we have 40's on our 06 ss and they soundawesome.

 

i have a set of flowmaster 40s and it sounds soooooooooooo awesome. i have sound clips if u wish to hear but yeah i dont like maggies too much popping noise for me