I'm not sure that it would match the bolt pattern but it might. The quickest way to find out is buy a gasket for your car and see if it lines up with that manifold. Now I'm almost certain that for the time and expense you will eat up making this fit and work well you would have been better off buying a header. Go look at the location of your 02 sensors and understand that you will need to find a place to re-locate them. You probably will have to fab a straight pipe of some distance between that flange and the new cat. That's where you will need to put the first one.
That all being said I am all for trying wierd and different things.