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The consensus on this subject is GHL and Borla etc. all drone at 2500-3000 rpm. They sound great but you must be prepared to put up with the resonance. The Pedro mod or Fister mod don't sound quite as good but there is no resonance. I had Darin Fister mod my 2000S stock muffler and I am very satisfied. He is located in Knightsen, CA. The cost was less than half of what a GHL or Borla would run.
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