The flange has sheared off the base of the cat on my 1.0l Sirion 55 reg. I am being quoted over £1000 for a replacement cat (and £350 for the exhaust).

Since they use the same 1KR-FE engine, has anyone looked at using parts from Yaris/Peugeot 107 (£300 for cat) on a Sirion (I assume the exhaust is unlikely to be the same, but I think there is a good chance the cat is compatible).