Though it's better known for its performance, the Porsche Cayenne is about to get another ultra-efficient option in the form of a plug-in hybrid dubbed the e-Hybrid, reports Motor Trend's European correspondent. Like the current Cayenne Hybrid, the e-Hybrid will utilize a supercharged 333-hp 3.0-liter V-6 paired with an electric motor sandwiched between the internal-combustion engine and the transmission. The motor is reportedly good for approximately 100 hp, resulting in a total system output of 420 hp.

Due to the growing number of European cities with emissions surcharges for inner-city urban zones, a driver-selectable mode would allow the engine to "top off" the batteries on approach to the city, facilitating all-electric driving in the urban center. Electric-only range will reportedly be in the neighborhood of 15 miles, with the system powered by a 10 kW-hr lithium-ion battery. Like the Chevrolet Volt and other plug-in hybrid models, the Cayenne e-Hybrid is expected to get a smartphone app that allows owners to control the climate functions and monitor charging status while the vehicle is plugged in.

The same report also hinted that the torque-beast Cayenne S Diesel and its 377-hp, 627-lb-ft 4.1-liter V-8 could be coming to the U.S. market with the next model line update. The engine reportedly meets U.S. emissions regulations with the help of an SCR fluid-based exhaust catalyst.

All 2014 Cayenne models will feature increased use of LEDs for exterior lighting, with full LED headlights offered as an option and LED front running lights and taillights standard across the lineup.

Source: Motor Trend