What Drumtochty said. I just had mine replaced by Sam Goodwin; a couple of hours work requiring the brace bars, undertrays, exhaust and propshaft to be removed, then a five minute fix. Working under a lift gave me a good opportunity to wire brush and underseal many difficult to get to places. Best to let a garage do it with careful application of heat to rusted nuts and bolts, otherwise you will end up with lots of sheared bolts.