By popular demand, Derek gives a year-by-year spotter's guide to the Air-Cooled Porsche 911.

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The air-cooled Porsche 911 was in production for three decades, with significant changes almost every year. In this episode of the Carmudgeon Show, Derek Tam-Scott, a hyphenated walking encyclopedia on vintage Porsches, chronicles the production changes. Memorize this, and you'll be able to identify the model year of any air-cooled Porsche 911.

We promise we've made this topic far more interesting than you'd expect — with updates on the Piëchisode, unintended defecation, other ICONS episodes, and Jason's profanely-named Dodge Grand Caravan, Jynah.

Plus, a 911 Spotter's Quiz at the end, just for fun!

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