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Discussion Starter #1
I just switched from a small car to my new Colorado, and everyone says gutting the cat is a good way to up the HPs cheaply. How does this change the MPGs? How long does it take to do this and more importantly, HOW do you do it? I've heard people say its simple and others saying it involves cutting into the cat and welding it back up when you are done. Someone please help! Thanks in advance!
 

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There is a How To in the Technical tips forum.
 

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No problem!
 
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