The almighty air-cooled Porsche 911 Turbo has returned, sort of

• Porsche built a single brand-new 993-generation 911 Turbo dubbed Project Gold.
• The 993 was the last generation of the Porsche 911 sports car to be powered by air-cooled engines.
• The Project Gold Porsche 911 will be powered by a 450 horsepower, twin-turbocharged flat-six from the 993 Turbo S.
• Porsche will auction off the Project Gold 911 in October with proceeds going to charity.

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The air-cooled Porsche 911 Turbo remains one of the all-time great sports cars two decades after the last one rolled out of the company's plant in Stuttgart, Germany. The 993, the final generation of the 911 to use air-cooled engines, remains one of the most sought-after Porsches in the world. With two-decade-old 911 Turbos fetching upwards of $200,000.

Now, Porsche is bringing back its old warhorse for one more tour of duty to celebrate the sports car maker's 70th anniversary.

Porsche Classic, the division within the brand that handles out-of-production models, decided to build a single brand new 993 911 Turbo dubbed Project Gold for its Golden Yellow Metallic paint scheme.

The Project Gold 911 was assembled and tuned over a period of a year-and-a-half by specialists at the Porsche Classics workshop near the company's headquarters in Stuttgart. The Turbo's manual transmission and all-wheel-drive system are both sourced from Porsche Classic's part bin while the chassis number follows that of the last street-legal 993 Turbo produced in 1998.

Even though the Project Gold 911 is classified by Porsche as a 993 Turbo, it is powered by a 3.6 liter, 450 horsepower twin-turbocharged, flat-six cylinder engine from the 993 Turbo S.

Sadly for Porsche aficionados, there will only be one Project Gold 993 Turbo produced. However, it will be up for grabs on October 27 when it hits the auction block in Atlanta through RM Sotheby's.

Proceeds from the sale will go to the Ferry Porsche Foundation which is a new charity dedicated to education, social issues, and youth development.

So in other words, buy this Porsche and help make the world a better place.