Nothing at all apart from one rear spring which was apparently damaged and cost £30 to repair at the BMW centre.
However, I have spent since then loads on it buying the new light clusters (clear white ones) and alloys for it.
There is some slight rattle on bumpy roads but this is due to the 17 inch alloys and low profile tyres ;-)
Overall an excellent car that could do with more power, however the new 316i's have 1.9 litre engines in them so maybe they are slightly quicker......
Its worth upgrading to the 1.9 It has an extra 38bhp.