i just installed my spoon headers onto my ls/vtec motor, i also put in 2.5 piping all around now my check engine light goes on. what can be the problem well i already tried unplugging the battery still didnt work. tried to self diagonostic and couldnt understand it....im thinking that it could be the o2 sensor but ive also been told its not because the cat is still on???need help

 

uhh...what cel is it throwing?

 

headers?