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Old 05-14-2013, 04:15 PM   #21
thahemp's Avatar
Drives: 2012 Black LS3
Join Date: Jan 2012
Location: Derby, KS
Posts: 4,347
Cats are ineffective until they heat up too. My drive to work is 2 minutes long. My factory cats haven't done sh!t for the environment for 75% of all the miles on the car.

You get headers, and you've moved them even further down the exhaust stream. They say 5 minutes on a typical car before the cat is at operating temp. It would be even longer with headers + HF cats.

I'm not worried about the EPA prosecuting me for something that is perfectly legal in my state.
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