A mysterious prototype of the second generation Audi Q7 has been spied on the 'Ring featuring four exhaust pipes.

Audi board member for technical development Ulrich Hackenberg confirmed last week the all-new Q7 will go on sale in 2015 and will get a hotter SQ7 derivative in 2016. Chances are the prototype spotted here is the SQ7 judging by the quad exhaust system while under the hood could be an adaptation of the powertrain installed in the interesting RS5 TDI concept.

As a consequence, there should be a twin-turbo 3.0-liter V6 TDI engine working together with a "supplemental electric turbocharger" and a lithium-ion battery. In the aforementioned RS5 TDI concept the system puts out 385 PS (283 kW) and 750 Nm (553 lb-ft) but for a possible SQ7 it will likely be uprated to match the weight difference.

Speaking of weight, the bulky Audi Q7 is set to lose as much as 800 lbs (363 kg) as a result of switching to the MLB Evo platform. The considerable diet will be enough to allow Audi to mount a 4-cylinder, 2.0-liter TDI in the entry-level version. An e-tron variant in longer wheelbase guise has already been confirmed with a 3.0 TDI V6 + electric motor combo estimated to generate 373 PS (275 kW) and 700 Nm (516 lb-ft) while returning 58.8 mpg US (70.6 mpg UK or 4 liters / 100 km) and an all-electric range of 31 miles (50 km).

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