Not without a lot of cutting and welding. And if you're on about a stainless steel jobbie, yo have to make sure it's at least the diameter of you standard exhaust. Dont want a smaller diameter pipe. More hassle than it's worth if you ask me, but it's up to you and what you wanna do.
Just make sure that the connection at the cat is similar as i had some problems myself if you look back in this section of the forum. The pipe conection may be too long or too short but you wont know until you put them together. The powerflow one I had was fully matching until the pipe just before the middle box which had to be cut and replaced not too much hassle.
I think my car actually has a manifold from another model than the 1.8 it should too with a different cat set up.