Loss of power in my rx8

Hey guys im new to this forum and i cant post on troubleshooting so i need help. a while back i got a p0420 code and it came on and i deleted it and it never came back. so recently i got my spark plugs, ignition coils, and wires replaced at 45k and yes i know thats bad and i dont believe they were replaced before because i bought the car at 23k miles. as soon as i replaced these i got a major loss in power and a little hesistation came up today. i believe its either cat or compression loss. let me know what you guys think