Porsche Cayenne Coupe: new BMW X6 rival revealed

Rear occupants sit 30mm lower than in the Cayenne, freeing up more rear head room despite the sloping roofline, according to Porsche.

Boot capacity is put at 625 litres, rising to 1540 litres when the rear seats are folded down. This is 145 litres and 170 litres less than the Cayenne. The Cayenne Coupé Turbo has slightly less space, at 600 litres and 1510 litres.

By comparison, the soon-to-be-replaced BMW X6 and the Mercedes-Benz GLE Coupé have 550 litres and 690 litres of boot space respectively.

Up front, the dashboard, digital instrument display, touchscreen infotainment system and other controls are shared with the Cayenne. The Cayenne Coupé will be produced alongside that car at Porsche’s factory in Leipzig, Germany.

The Cayenne Coupé also comes with a panoramic glass roof featuring a glazed area and integrated roller blind as standard. Buyers will also be able to specify it with a contoured, carbon-reinforced plastic roof similar in style to that featured on the 911 GT3 RS.

The optional roof is available as part of one of three lightweight sports packages, which also include unique exterior design detailing, 22in wheels, carbonfibre and Alcantara interior trims and, on the Turbo model, a sports exhaust.

The Cayenne Coupé will initially be sold with the choice of two petrol engines, although others, including a pair of petrol-electric plug-in hybrid drivetrains shared with the Panamera, are expected to be added to the line-up by the end of the year as part of Porsche’s electrification push.

The entry-level Cayenne Coupé is powered by a turbocharged 2.9-litre petrol V6 producing 335bhp and 332lb ft of torque. In combination with a standard eight-speed automatic gearbox, it has a claimed 0-62mph time of 5.9sec and a top speed of 151mph. Official fuel economy is 30.4mpg and CO2 emissions are 212g/km.

Further upmarket is the Turbo, which has a twin-turbocharged 4.0-litre petrol V8. With 542bhp and 568lb ft of torque going through the same automatic gearbox, it has a claimed 0-62mph time of 3.9sec and a top speed of 178mph. Fuel economy is rated at 25.0mpg and CO2 emissions at 258g/km.

The 567bhp twin-turbocharged 4.4-litre petrol V8-powered BMW X6 M and 577bhp twin-turbocharged 4.0-litre petrol V8-powered Mercedes-AMG GLE 63 S Coupé both have a claimed 0-62mph time of 4.2sec and a limited top speed of 155mph.

Porsche is yet to detail the changes it has made to the Cayenne's suspension for the Coupé. However, it has confirmed that all models will receive speed-sensitive power steering, 20in alloy wheels, Porsche Active Suspension Management (PASM), the Sport Chrono package, Park Assist and a rear-view camera as standard.