I have 99 civic i didnt run a test pipe but actually bored the honey comb inside the catmy CEL always comes on when i drive in the freeway or in cruising modeOBDII codes out 67(cat system effiency below threshold) so im in the same situation as S&P i was thinking of putting the 2 O2 sensor near each other since these 2 sensors are just comparing voltage from each other..maybe im wrong i dont know but someone can help us out . that`ll be woop ass..!
BILL: can u give more details on the resistors?? thanks