Editorial view:

Unless BMW decide to introduce a true M car version of the Z4 then the M40i is as close as we are likely to get, with a turbocharged 3.0 litre 6 cylinder petrol engine giving a huge 340 horsepower, it will hit 60 mph in just 4.5 seconds and its top speed is limited to 155mph. The mid-range torque available via the turbo really makes the car feel significantly faster than its 2.0 litre engined siblings, but we would always recommend a test drive as there's quite a difference in the monthly leasing cost between them. BMW does throw in a chunk of extra standard equipment in the Z4 M40i model over and above what you'd get in an M Sport, so you do at least feel you're getting a little extra for your money, such as 19" M double spoke alloys, M Sport differential, adaptive suspension, and half leather half alcantara seats.

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