I would like to use a stock b18 exhaust on my civic for the sound concern and to avoid police check. I have a y7 (changing exhaust manifold) so i need a new exhaust and cat. Would it be possible to use a integra exhaust my sedan civic(99)? bolton or not?

I think that the b16 would fit. I am right here?

Does the b18 et b16 exhaust have the same size(diameter) and do they share the same shape?
Doest all integra have the same exhaust(b18B, b18C)?

 

Nobody knows the stock size of those exhaust and if it fit?