By popular demand, Derek gives a year-by-year spotter's guide to the Air-Cooled Porsche 911. == Click here to join the Hagerty Driver's Club: https://bit.ly/Join-HDC-Cammisa-ICONS == 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!