If I change out the exhaust as in a post below it does affect my CPO warranty right? Wife would like a little more off the line power as that post suggests it does.

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For more off the line power this is what I did; Change to Synthetic motor oil (especially Mobil-1 0W30 or Pennzoil Ultra), use 91 octane fuel or higher. If you already do this, then maybe a Magnaflow muffler like Carver did will help.