Originally Posted by bega
a 99 civic has 2 o2's on the exhaust system right? I have one installed correctly, and the other one is just a dummy, cause its on the headers, and thats not where its supposed to be, could that be a problem?
yup that could be the problem becuse the o2 sensor is what monitors the fuel to air ratio after burnt
also what they are talking about on the new exhaust systems smoking is that they are usually cooled and coated in oil for long life and looonger shelf life