Lately the V60 has developed a tendency to rattle under very hard acceleration. Metallic kind of sound, almost like the exhaust is banging around or maybe a heat shield...or maybe a gremlin is sitting in the back with some rocks in a tin can. I think its coming from the back of the car but not sure.
Doesn't happen during "normal" driving at all, only when you really give it the beans.
This is starting to get a bit irritating.