stainless will sound different to mild steel slightly some people will say different but it does (different resonation) shouldnt be any difference between brands if the bends are in the same place in the system I had a full "mandrel" bent on my EB fairmont including strakkies but then my mate welded a stainless exhaust out of 316 stainless with proper manufactured bends (extruded from factory not bent) and it sounded heaps different exhausts are like a lot of things though they are all relative what you think sounds good your mate will think sounds droney and sh*ty