I have swapped a b16a into my 93 dx civic and I have some questions about the cat. Do I need to use one from an integra? The exhaust is hooked up, but it was very difficult to get it together. It seems like the header is shorter, which makes the exhaust slightly shorter. Now that it is on it seems to be vibrating against the undercarriage. I did not have this problem when the d series was in there. I have looked around trying to compare the sizes of a teg cat and a civic cat, and it seems that the teg one is a bit longer. Anyone have any experience with this problem?