The PO of my truck removed my cats, probably for the same reason I decided not to put them back. A 5.7 vortec has two an a replacement assembly is around $500. It hasn't hurt a thing without them. No fuel smell an it still got 16 mpg stock....
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Ok gotta ask!!!!! Why remove the cats. In a proper running vehicle the cats DO NOT hinder the exhaust. If they are starting to get clogged they will but not if they not. It has been proven time and time again on most street vehicles on the dump that removing the day does not hinder you numbers enough to even worry about leaving them in. Again this is in a properly running vehicle.
A cat will and does help cut down on the fuel smell that you most likely will get if it is not there. It helps burn the minute unused fuel/gasses that gets to the exhaust system.
A cat that is not clogged will not hinder your fuel mileage either.
So to all that just wanna remove them for the hell of it, I ask this..... Why? If it doesn't benefit you to do so. It will cost you, not much mind you but, to get a piece of pipe back up on there in its place. And aftermarket free flow style cats are cheep these days.
Ok I'm done steeling the thread you can have it back now.... lol.
Sent from what use to be a great country.
But to your ?? What size is the exhaust you have that is true duels? I would rather keep a true duel set up with an h-pipe then have a single exhaust. A duel set up with a crossover pipe, no matter what style, equalizes the pressure better between the two banks and will let them breath better/more efficient letting you make more power in the long run.
Sent from what use to be a great country.
I removed my cats on both the Sierra (pre-tune) and Yukon, not to mention my three previous trucks. Never set the light off, and I never messed with the O2s
I've toyed with the idea of removing my cats but now I'm hearing rumors of TX doing emissions testing and that cats would become something that they inspect.
Gonna be a while, EPA is shut down.
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