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Do you mean like changing from your stock single exhaust to an aftermarket dual exhaust setup?If so,yes there will be a significant change in your exhaust sound.
not to burst your bubble..but IMO glasspacks on a v6 dualed out are going to sound terrible. I dont think you'll be happy with them.All they will do is pop and crackle when you let off the gas. http:// w w w.3.8mustang.com/multimedia/
listen to those clips.