Hmmmm, I've been dealing with the same question... In terms of the best gains there are two options (that I've seen so far). 1. You can go with shorty unequals (I haven't seen any equals yet but that doesn't mean their not out there), a Bassani X-pipe, and a cat-back of your choice, or 2. You can opt for MAC or Bassani long-tube equals, a MAC or Bassani short H-pipe, and a cat-back of your choice.
Again, these are purely opinion based. I do not have any hard numbers or actual real world experience with the two options, but to me it seems like the two are nearly identical in terms of performance. For the 1st you are sacrificing performance in the headers, but gaining some with the X-pipe. For the 2nd you are gaining some with the headers, but sacrificing some with the H-pipe. For me the solution came in the form of ground clearance. I plan on lowering my stang an inch or two, and so I tossed the idea of the long tubes, and have decided to go with the shorty setup for my future mods.
I hope this helps.
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2000 GT Conv. 5speed
Triple Black
Current Mods: K&N
Future Mods: Too Many to list
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