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I prefer Dynomax or Magnaflow.
When you get the exhaust installed, get 2-1/4" pipe and make sure the shop installs an H-pipe. It will help balance the exhaust pulses from the two cylinder banks, providing a more even exhaust note and a smoother running engine.
I agree with Starfury, at least this part of his answer. If your motor is bone stock at least go with the 2-1/4" exhaust & H-Pipe and go with a nice set of Dynomax. Here is a good link I came across: