Jerry Seinfeld might be a comedian, but he’s dead serious about Porsches, and he’s one of the pre-eminent collectors of our time. This particular 2016 911 GT3 RS was custom ordered by Seinfield, and do we mean custom. Additions such as a special Liquid Chrome Blue Metallic paint, carbon-ceramic brakes, front-axle lift mechanism, Sport Chrono package, and a 23-gallon extended-range tank sent the price up, oh, about a quarter mil, for a grand total of $449,890. Standard features include a 4.0-liter flat-six engine with 520 horses, carbon-fiber engine cover, magnesium roof, rear-wheel steering, and carbon fiber racing seats. The current owner (not Jerry) is putting it up for sale for between $290,000 and $330,000, a relative bargain compared to the original asking price. Bidding is already underway.