There are several milestones that mark the evolution of the Porsche 911. Such as the transition to water-cooled engines in 1998, ending 35 years of air-cooled tradition. Fast forward to the 2012 model year, the last-generation 991 generation, and we find another revolution: turbocharging across the lineup, sans the GT model line. And going forward, the last-generation Porsche 911 could be more "unique" than we realize.

And that's not our word used to describe it. That's coming from Porsche North America CEO Klaus Zellmer.

Speaking with Hagerty, Zellmer touched on the past, present and future of the Porsche 911, and commended the 991 generation for existing so long as it did into a transformation phase happening at the company.

"You know that by 2025 our overall lineup will be 50 percent electrified, either as a plug-in hybrid or as a battery-electric vehicle," Zellmer said to Hagerty. "We are transitioning, actually in short time, almost abruptly, into new technology driven by its availability and its fit with the Porsche brand."

Of course, this means further alterations to the Porsche 911 formula, whether its loyal fans are into it or not. Zellmer wouldn't say exactly what the world can expect, but the writing may still be on the wall with how he describes the 991 and 992 generation Porsche 911 sports cars in the pantheon of history.

"I can't tell you what the next generation after the 992 will look like, but I can say that when we look back in five years at the 991, and the 992, we might say 'wow, that car with that technology was actually really unique for its time.' It will prove its historical value in retrospect. The transition time is so compressed with new technology and the need to make radical changes, we are looking at cars coming out now that might be truly unique in five years," Zellmer said.

Reading between the lines, it's likely that the 991 Porsche 911 will be the last without any form of electrification. The current 992-gen Porsche 911 has been designed to accommodate an electric motor, but the debut of a 911 hybrid remains under wraps for now. When it *does* happen, an electrified Porsche 911 will likely possess incredible power.