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Asylum - with LT's it does push the O2 sensors back, but if you are picking up a set new then any reputable company will have the O2 sensor extention harnesses included. It is your option to use or not use high flow CATS that are offered by the same company or to have some other brand added. If you opt not to use CATS, then yes you do have to program out the P0420/P0430 codes to keep them from setting your Service Engine light.
I just completed the install of a set of Kook's last night on my LS3 and it was very easy and straight forward. I used their HF CAT's which bolted directly up to the existing pipes using the factory clamps too. I have had no codes trip last night or today and have read on a number of posts that no one seems to be having any code issues.
Cheers!
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2SS/RS SIM M6 Polished 20's, Hockey Strips,
GFX, Kooks LT's, High flow CATS, Magnaflow x-pipe, Vararam CAI
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