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It really depends on what you like. There are so many exhaust systems out there and they all sound a little different. Vist the manufacturers, enthusiasts, and dealer websites and listen to sound clips also try to find Mustangs near you and ask what exhaust they have. Then decide what you like best.
I didn't vote for either of them. I think that you should get SLP's. They sound so awesome!!! But, if you don't like it really loud, then you should get the JBA's.