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Check your MAF sensor. Some of the early models, 10's and 11's had some MAF sensors that are considered "weak". See if it is just a number, or has a letter in front of the number, the lettered ones are the "strong" sensors. It seems the weak sensors cause issues with cai's.
Double check the installation of the exhaust for leaks. There's nothing about a catback that is going to change the performance of the car noticeably. It is the cats that create the first and largest restriction in the system. However, if there are leaks, it can effect the downstream o2 sensors.
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