I have a Moroso stainless steel axleback (alson known as spiral flow) on my 06 GT with about 200 miles on them. My car is stock except for a blower and the mufflers are not as loud as I would like. They are in excellent shape and the quality is very nice. I would like to trade for SLP Loud Mouths, but will entertain other muffler offers. Please send me a text or call @706-681-4896 or PM me. Thanks for looking.