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mikepellegrini mikepellegrini is offline
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Join Date: Sep 2007
Location: Tacoma, WA
Posts: 1,852
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I punched the cats in both my cars and it never affected passing emissions.

What it did do was make the sound deeper and throatier - which I like.

There is no effect to the smell.
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97 Ford Expedition

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Old 05-16-2018, 06:32 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #11 (permalink)