Originally Posted by re-rx7
Tim would you say a Tune is needed with a O/R X or H? From what I've researched the COT protection only kicks in on decel? The worst I can see happening is you run a tad bit richer and a check engine light. SOme tunes like AED and such have specified they dont change anything just remove the Check Engine light? Input?
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When you remove the cat's with no tune changes, it indeed becomes rich. But it actually
over-richens itself so much so that it's a power losing state of richness. It exhibits that state under cruising, WOT the whole bit. Not just decel.
So, yes. If you delete cat's you'll need to make more changes to the computer than the car is able to handle on it's own or simply turning off a code.
OP; if you've already paid for a tune and need changes for O2's to be made etc. call SCT and have them make the changes and go from there until your ready for custom. Axle-backs need no changes as they are post O2 and you won't experience CEL's.