I just did the American thunder cat back with the super 44's they do sound different then the older 40 series flows i had on the car...I had a complete Mac cat back on my 85 GT...To me i wasnt fan...
...I too am looking for something diffrent for my 87 im building i was thinking of going with an off road X pipe and either spintechs or
Magnaflow race mufflers...dont know if i should do dumps or tails either...im confussed just like you....LOL... Oh yeah here is 2 clips of the new 44's on my all stock motor all it has is a off road H pipe and
K&N drop in filter...see what you think....
Oh yeah i'll post the 85 that had all Mac too...
YouTube - 85 mustang GT
YouTube - MOV00361.AVI
YouTube - MOV00363.AVI