bigsapper

iTrader: (2)

Who here has a set of headers installed that retains the 3 cats that are on the 2012-2013 trucks?

Looking to get some ideas on how to do this.

62nalide

iTrader: (1)

My question is why would you want 3 cats? The more cats the more power you lose. Would you consider 2 high flow cats? I'm sure you have a reason to want 3.

bigsapper

iTrader: (2)

It's illegal to remove them?

thewrx

You just need two good quality high flow cats.

NKPPhil

Here in the Portland OR area I'd get busted as soon as the DEQ plugged their computer into my OBD port - it's a required test in order to renew license every two years, for any vehicle newer than 1975. Not sure about your state laws.

BLACKND

iTrader: (5)

Is the third cat even a cat, or a resonator? I've looked at mine, but doesn't seem to be and o2 sensors reading the 3rd. I'm going to be doing my exhaust soon and have considered cutting it off.

AUTOT3K

iTrader: (3)

That "3rd" cat in the y-pipe is just a resonator, if he's talking about the one just after the 2 pipes become 1

bigsapper

iTrader: (2)

My understanding is that it is a catalytic converter and not a resonator.

bigsapper

iTrader: (2)

http://www.silveradosierra.com/exhau...do-t13692.html

The second pic of the 3 is actually the third cat I'm talking about.

62nalide

iTrader: (1)

Not if they are getting replaced with Highflow cats, also the 3rd is not a cat well my 2011 Denali had 2 with a 3rd look alike which was a resonator