Hey Feuss buddy. Of the parts you've installed, how many of these req'd the use of Hondata/Programmer for them to work to an Optimal?
Once you make significant changes, you will need to change your calibration.
Theses cars do not have an air flow mass (AFM) sensor, so they can only calculate how much air to expect at a given rpm/load/cam/cam angle combination, then react to a difference. If the ECU is always playing catch-up, fuel economy and power could take a step backwards.