Cobb down pipe if you want a cat, Perrin (split waste gate) or Invidia (bell mouth) if you dont want a cat - Kevin is correct as long as you plan to live in Nevada you should pass smog with either unit. However I would not expect it to last forever as the state will at some point add a sniffer test to the check. At that point the Cobb sounds better.
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Cobb Stage 2
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