the d15 engine in the cx has the cat right off the exhaust manifold, not underneath. Therefore u really can't buy a catback for a cx. What you can do is find the exhaust of a dx hatch and it should bolt right up. Not sure, but I know that the cat is right off the manifold. Or you could just hack your exhaust where it should mount up and have something fabbed to hook up to your catback those are really your only options.