exhaust pipe rusted away!

[Tommy]

was driving the zed today, when it started sounding like a bloody tractor, had a look underneath and on the pipe before the clip (not the back box side) it has totally rusted away and snapped off! my car is still under warranty and is actually going to the garage on monday to have a new manifold. i just got in touch with the garage and he said he didnt think the exhaust would be covered, i thought surely it would be! so i need to get in touch with the warranty company. anybody know how much a new pipe would cost???