1998 Honda Civic exhaust manifold

Is your vehicle v-tec or non -vtec?

The non vtec motors (d16y7) have the catalytic convertor and the manifold as one unit and you must replace the whole assembly which can be upwards of $300.

If its a v-tec model, than it is a lot cheaper, probably half of that.

Unforunately I live in Canada, so our prices vary from in the states, so I cannot tell you exactly how much it will cost.