Ok, I have a 99 DX and it's cat is clogging up. It's got the manifold cat combo unfortunately.
I also have a 95 EX that at the moment has a hole in the side of block.
Will the exhaust off the 95 fit the 99? Or just a few pieces? How hard will it be to swap the whole thing?

 

I have no cash at he moment to spend on this.

 

nobody knows if the 95 ex exhaust will fit a 99 dx?

 

It would generally fit. The center pipe under the car after the cat would need to be modified to mate with the back of the cat. (I don't think the 95 pipes from the cat back will fit the 99 body) You will need to install a bung for the second O2 sensor after the cat. Also the wires for that sensor need to be extended.

First though, fix the rich run or misfiring problem that damaged the cat, or you're just going to ruin the new one too.