All of you are mvp im somewhat new to the ep3 life but ive had 3 k20a3 in total base rsx auto rsx and my current ep3 my plan is to do the a2 head swap with rbc intake kpro v4 i currently have a cold air intake set up pullling in air at 70-80 degrees with dc sport longtube headers and a cat deleted catback stock exhaust but i keep getting o2 and cat codes along with knock sensor code which i put a new one and it still came up and after i drive for a bit sometimes it goes into limp mode it gave me a code i got in my rsx once that i had to replace the vtec solenoid so i did that and it still came up after a week can anyone enlighten me a bit please lol