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Originally Posted by ZL1power69
yea other people have mentioned a resonator on the new trucks so i guess that is it. its a small canister about 5-6in long at the bottom of the y-pipe before the cat. engine is the 4.3 vortec csfi w/ auto trans. there is 1 O2 in the y-pipe on the drivers side and 1 O2 after it but before the cat.
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I am not real sure about it but it maybe a pre\small cat.
You might check the parts book and see what it says about it.
Unless you have to much back preasure I would not replace it.
If you find out for sure what it is let us know.
Good Luck
MT