Its 2.7-litre six-cylinder engine now develops 176 kW (240bhp), 8 kW (12bhp) more than previously. The performance of the Boxster S, which will be launched simultaneously, has also been increased to 206 kW (280 bhp) from 191 kW (260 bhp).
The Boxster sprints from 0-62mph in 6.2 seconds, while the S model achieves this in 5.5 seconds. Top speed is 159mph for the Boxster and 167mph for the Boxster S.
The new Boxster also features a revised five-speed manual transmission, with the S model benefiting from a new six-speed gearbox. The gearshift had been revised for both transmission variants so that shift travel is now considerably shorter. Both vehicles can be optionally equipped with the five-speed Tiptronic S transmission.
The Boxster is the first roadster in the world to offer passengers protection against lateral impact using head airbags. In combination with a thorax airbag, concealed on the outer side of the backrest, the airbag deploys from the side window rail of the door and provides a high level of protection for the head.
The Porsche Boxster will be priced at £32,320 (inc. VAT) and the Porsche Boxster S at £38,720.