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no. only sensor you have should be upstream of the cats anyway

but its gonna be hard to find someone to weld it together for you, unless you can yourself. whether there are emission requirements or not, its probably illegal in your state for any exhaust shop to put exhaust on your truck without a cat
 

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I removed the rear cat in my exaust and had a flowmaster and custom exaust put in... so i still have 1 cat... no problems...
 

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The oxygen sensor, even though upstream, picks up the heat from the catalytic converter. So, it could affect the computer if you remove the cat and possibly run rich.
 

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No it won't mess up the computer itself.

The computer just reads data and tell the motor to do what it needs to do.. :thumbup

But to answer your quetion.. You can pull the cat and you'll be fine.
 
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