yep. I would agree with Rab tbh, like anything else, budget comes to mind. When I said being one of the cheapest options, I meant it as being engines and ancillaries that is know to fit in these cars as well as good performance. Certainly FAR cheaper than trying to get a jap engine to fit and run. and a very quick look on autotrader would suggest an 11k+ value on the current car, with 335i convertibles available from 11k upwards, couple of years older of course, but less hassle in the long run. By time you have got all the bits for an engine swap and labour, possible insurance differences, then I reckon its a no brainer to sell that and buy something that ticks the boxes you are after