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Ignore the comment about the o2 simulator, because there is no o2 sim offered for our cars (by our cars, I mean us ecotec owners), and your only option is either A: set off a CEL due to an obdII incompatible cat, and not knowing when something that REALLY is throwing a CEL light is actually happenin, or B: getting an OBDII compliant/compatible Cat, and leaving the stock o2 sensors (both of them) in the exhaust in their appropriate places. ALSO, if you are planning on staying NA (naturally aspirated) I would recommend only steppin it up to 2.25 as you will be losing back pressure, and may suffer more losses than gains with the oversized exhaust. HOWEVER, if infact you will be increasing performance on the car, make sure that the mods planned, will warrant a 2.5" exhaust.
Cheers,
Landon
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