The Porsche 911 GT3 is among the diminishing ranks of naturally-aspirated performance cars, and while the apparent advent of a Cabriolet version might lessen the ‘purist’ factor for some, it also opens up headroom for its occupants’ aural enjoyment of the 4.0 litre flat-six.

This mule is likely to adopt the fixed-roof GT3’s engine tune, meaning a similar, if not identical set of output figures mirroring that car’s 500 hp at 8,250 rpm and 460 Nm of torque at 6,000 rpm; that engine goes to 9,000 rpm before the limiter calls time. Transmission is most likely the six-speed manual unit as employed in the GT3 Touring, judging by the three-pedal layout spotted here.

Adoption of PDK transmission here remains to be seen. Further along, the Cabriolet can be expected to adopt details such as dynamic engine mounts, locking differential and active rear axle steering. Wheel diameter appears to remain at 20 inches.

Chassis setup should be similar to that of the GT3 Touring coupe’s, albeit with detail tweaks to account for dfferences in bodyshell rigidity due to the lack of a roof. Two different test mules have been spotted, one fitted with ceramic brakes and the other with shinier steel discs. Performance figures can be expected to be marginally slower than the coupe’s 3.9-second 0-100 km/h time and 316 km/h top speed.

GALLERY: Porsche 911 GT3 Touring Package