What am I looking at?
So what's new?
Well, in a word, power.
A bit of tweaking and fettling sees an extra 15hp from the 3.4 litre units you'd find behind the driver of both cars, pushing the Boxster GTS to 326hp (330PS) and the Cayman GTS to 335hp (340PS). There's a dollop of extra torque too - 273lbfft and 280lbfft respectively. Both cars are propelled to 60mph 0.3s faster than the standard "S" models and will push on to 174 and 177mph.
Reining in the power, each GTS is fitted with Porsche's active suspension and the Sport Chrono package as standard. While it may sound like a wristwatch, Sport Chrono is a system which adds magnetorheological (tech speak for electromagnets) damped engine mounts that reduce the movement of the powertrain under certain high-load conditions to prevent the mass transfer of the car's heaviest component interfering with your back road blat.
Both cars will achieve a combined fuel economy of 34.4mpg with the 7 speed PDK transmission or 31.4mpg with the manual. This represents a slight fuel economy penalty compared to the S models - while Porsche is keen to stress the new engines are Euro 6 emissions standard compliant, the standards are the same for petrol cars as Euro 5 - but they remain in the same VED brackets.
Both cars include black-finish 20" Carrera S alloy wheels, a model-specific front spoiler and black-finish bi-xenon headlights as standard. As an optional extra you can specify a sports chassis that lowers the ride height by 20mm.
How much will it cost me?
The Boxster GTS starts at 52,879, with the Cayman GTS beginning at 55,397 - around 4,700 more expensive than the equivalent S versions. That's before options of course - the click-happy can rack up another 38,000 from Porsche's famously potty extras list, including leather air vents and a body coloured key...
In many ways, the Boxster and Cayman are the leading alternatives of each other. Looking further afield, the established leading rivals are the BMW Z4 and Mercedes SLK - at this price and performance, only the Z4M and SLK55 AMG will do. If you're looking for mid-engined thrills though, the Germans are left wanting - but Lotus have you covered with the Evora, particularly the 345hp S model.
The biggest competition of all comes in the shape of Jaguar's F-Type particularly with the coupe on the way too.
In a line...
The fastest versions of one of the best ever drivers' cars yet.