I have a Moroso Axle Back on my 06 GT and they are louder than stock, but not as loud as I would like. They have about 200 miles on them and the quality is very nice and in great shape. So if your mufflers are to loud let me know what you got. I prefer the SLP loud mouths, Borla stingers, or the MagnaFlow bullit style mufflers. text or call 706-681-4896 or PM me.