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Originally Posted by 02civicsi
Yes, there is a "hole" for the defouler to plug into. There are usally two bungs welded onto a RH. The one nearest the engine if for the primary and the one farther to the back is for the secondary which is the o2 sensor for the catalytic.
The drilling has to do with the defouler itself as where the O2 sensor screws into is not quite big enoug. Yes, you will fail inspection if they "sniff" test your car.
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damn the "sniff" test! any logical solution to passing emissions. can i cheat? i would have an exhaust shop weld in a cat with custom 70mm piping to the muffler, but a apexi muffler or greddy tip would be almost as much as the whole cat back exhaust. it is 2 years untill i need to get the emissions test... but i dont want to swap back the stock header and exhaust. what options do i have?
BTW- thanks for the feedback, it is much appreciated.