Catless emissions

bill silvis

Well-Known Member
81
12
Latrobe Pa
Vehicle Model
Civic si
Body Style
coupe
okay so I'm sure this had been asked 1000 times and I know the defouler answer but I'm not entirely sure on it I don't know the exact thread size on the o2 or the defouler. If someone could give me those sizes or what I need to buy or even link me to a thread with that info it'd be greatly appreciated.
 
The companies that make the catless downpipes have options to buy defoulers from them, or they come with a defouler when you buy the downpipe (depending on company). Did you already buy the downpipe
 
Yeah I've had it for like two years now passed last year but it was illegal and I need the defouler now I have a full race dp
 
And that's exactly what I was looking for thanks I couldn't find the thread size anywhere and didn't want to but 4 different sizes at the parts store
 
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