I have the magnapacks on my 98 GT and had Borla Stingers on my old 04 GT, imo both are not good candidates if you do not want rasp, especially borla. I love them both but they are very rough sounding not smooth and low rumble like a prochamber and flows or macs.
Imo for what you want I would suggest a catted pro chamber and either flowmaster cat back or weld in mufflers
__________________
|