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Calm down.
There are only 2 ways to prevent CELS
1) You only replace the exhaust behind the factory manifolds with the first set of cats. This is typically called a "Catback" system. Swapping these out will not create CEL problems because the original factory manifolds and first cats are still in place.
2) If you install headers with aftermarket cats or no cats in place of the factory manifolds and factory 1st cats then you WILL get CELS, in this case the only way to prevent them is to use software tuning such as Snap-Flash that will change your O2 sensor readings to not trip CELs.
Does that explain it better?
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