Spy shots of the facelifted Porsche 911 were sent to us by our trusty spy photographer, although this time something about the prototype caught our attention that could point to a different, and potentially more powerful 911. Take a closer look at these photos and you might notice that instead of the quad exhausts of the 2015 911, this particular model is sporting a pair of center-mounted exhaust pipes, similar to the setup used on the 2014 911 GT3.

So what could this interesting little nugget mean? Our best guess is a revival of the GTS, something we haven't seen from the 911 since the 2011 Carrera GTS arrived in the scene back in 2010.

Another potential model is the 911 Speedster, and the bulging rear end -- a little more so than the standard 911 Convertible at least -- could be a clue that points in that direction. The canvas roof and the windshield looks unchanged though, and if this is the Speedster, it's probably an early prototype that will undergo some changes before a production model rolls out.

Either way, what we're looking at here is a new trim of the 911 that we haven't seen in quite a while. Our hunch is that this is the 911 GTS, and if it is, it's definitely a welcome addition to the already growing 911 family.

Let us know in the comments what you think this model is.

Spy Shots

While the center-mounted exhausts are getting most of the attention, other parts about this prototype that lead us to believe that a more performance-oriented Carrera is coming are those new aero flaps in the front bumper that open to increase cooling or close to reduce drag. Look back at the spy photos we have of the 2015 911 Convertible and the 2016 911 Turbo and you'll notice the difference.

2016 Porsche 911 Turbo

2015 Porsche 911 Convertible

911 GTS History

The Porsche 997 GTS was first unveiled at the 2010 Paris Motor Show and of all the 911 models in existence at that time, the GTS was considered the most powerful Carrera in the lineup.

Whereas the standard Carrera S produced 385 horsepower from its 3.8-liter flat-six engine at that time, the GTS upped the ante with 408 ponies from the same 3.8 powertrain. It was essentially, the supercar of the Carrera lineup and its performance, when tacked in with the Sport Chrono Package Plus, lived up to its billing with top speeds in excess of 190 mph, all while hitting 0-60 mph in just 4.2 seconds.

In the U.S. market, the GTS coupe was priced at $104,050 and the convertible version at $113,850.