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New BMW Z4 2020 pricing and specs detailed: M40i flagship powers up

The top-spec BMW Z4 now produces 285kW of power and 500Nm of torque.

For 2020, BMW has increased the power output from its Z4 M40i flagship by 35kW, without adjusting its price from $124,900 plus on-road costs.

The range-topping Z4 now generates 285kW/500Nm from its 3.0-litre turbocharged six-cylinder petrol engine, putting it in line with other M Performance models like the M350i sports sedan and the X3/X4 M40i SUVs.

This means that the Z4 roadster will now accelerate from zero to 100km/h in 4.1 seconds, which is four tenths of a second faster than the model that launched earlier this year.

BMW has made no changes to the rest of the range, with the base sDrive 20i and mid-spec sDrive 30i holding steady at $84,900 and $104,900, respectively.

The updated BMW Z4 M40i will be available by Q1, 2020. The updated BMW Z4 M40i will be available by Q1, 2020.

As before, the 20i utilises a 2.0-litre turbocharged four-cylinder petrol engine that delivers 145kW/320Nm, and like the rest of the range, is standard with an eight-speed automatic transmission.

However, the base variant can be optioned with a six-speed manual transmission at no extra cost, which according to BMW, does not effect its ability to sprint from zero to 100km/h in 6.6 seconds.

The sDrive 30i uses the same 2.0-litre engine, with a significantly warmer tune. It is capable of a 0-100km/h time of 5.4 seconds, and produces 190kW and 400Nm.

Other than the increased power output, stepping up to the M40i affords customers a unique suspension setup, an M Sport Differential and a 12-speaker harman/kardon surround sound system.

Dealerships will offer the 2020 BMW Z4 in the first quarter of next year.