Last year, the world saw Porsche's new 911 make its debut and not long after, the new Boxster was announced. Porsche have now completed the updates to their sports car line-up with the debut of the new Porsche Cayman (and more powerful Cayman S) at the LA Auto Show.

The changes are largely along the same lines as the latest Boxster, being up to 30kg lighter, 40 per cent stiffer and 15 per cent more efficient than the previous generation.

Although the new coupe and its convertible sister car are very similar, there are slight styling differences. The most significant is the fixed metal roof compared to the Boxster's soft-top.

This has allowed the neat integral rear spoiler, carried over from the Boxster, to merge with the car's profile far more convincingly with a sloping rear screen in place of the soft-top's slightly awkward rear.

The front bumper also has a slightly differently-shaped air intake to the convertible and the LEDs have moved from the bumper to become a circular cluster.

Prices start at £39,694 for the Cayman and £48,783 for the Cayman S and for that, owners get a few additional options that Boxster drivers have to pay extra for. This includes Adaptive Cruise Control and a premium sound system.

Both versions of the new Cayman are also a tenth of a second faster to 60 than the equivalent Boxster, with the 271bhp 2.7-litre flat-six Cayman taking just 5.7 seconds and the 321bhp 3.4-litre flat six Cayman S taking just 5.0 seconds.The Boxster is available to order now and is due in showrooms in March 2013.

See more of the new Cayman at the LA Auto Show below: