rough acceleration and loss of power

No expert here at all, but I've been doing a lot of work with my exhaust and engine lately so I feel I might have some insight. Check your 02 sensors that theyre attached correctly. If you went over a bump or bottomed out just right they could have been jostled loose. they're located under the car and if you have stock exhaust should be at the start of both sides of the mid pipe and then right before you get to the catalytic converter. Also check your battery, and if the battery is fine, look into the alternator as well, i had to replace mine about a year ago, and it was surging at 3 and 5k. best of luck! update us when it's all done

Not sure about the loss of power, but it could be related to your CAI. Is the intake inside the engine compartment? I so it could be ingesting hot underhood air. The factory intake pulls air in from the fender where it is cooler.

As for the power band, welcome to V6 performance! Our cars have 2.72 gears in the rear end, which is good for fuel economy but bad for performance. Any V6 won't have a lot of low end torque, and won't make a lot of power until you get the revs up a little, which is what you are feeling. You can make more use of the V6's limited power by upgrading to 3.73 gears. That will make your highway cruise RPM about 2500 instead of 2100 and it will use more gas, but it will feel like you have more horsepower.