Supposedly, singles make more power than duals. However, like Spooler said: most of them sound pretty terrible. The GReddy RS Race sounds pretty good and is one of the more inexpensive options (if you want a single). Otherwise, you can't go wrong with either the FI or Motordyne exhaust unless you wanted the Verus/Velox diffuser... then definitely get the Motordyne or be prepared to do some cutting.
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