Porsche is putting the finishing touches on the facelifted 911 as our spies have caught the 911 Targa and 911 Turbo S undergoing some final testing before their debut at the Frankfurt Motor Show.

Porsche is putting the finishing touches on the facelifted 911 as our spies have caught the 911 Targa and 911 Turbo S undergoing some final testing before their debut at the Frankfurt Motor Show.

In typical Porsche fashion, the styling changes are subtle and include a new front bumper and modestly revised head- and taillights.  The models also have new engine vent covers and slightly revised rear bumpers.

The deja vu design continues in the cabin as only noticeable change is a new turbomboost button on the steering wheel.

Speaking to turbos, the 911 is expected to feature a new turbocharged 3.0-liter six-cylinder engine that develops 370 PS (272 kW) in the base model and 420 PS (309 kW) in the S variant.  The Turbo variants, on the other hand, are expected to feature an upgraded version of the current turbocharged 3.8-liter six-cylinder engine.

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2016 Porsche 911 Targa & Turbo S spied