Bugatti's Last Quad-Turbo W16 Roadster Heads to Auction With a $10 Million EstimateBroad Arrow Auctions just listed a car that makes everything else at Monterey Car Week look like a rounding error. A 2025 Bugatti W16 Mistral, finished in Matt Argent over Black Carbon with only 652 miles showing, will cross the block at The Quail Auction on August 14, 2026, carrying a presale estimate of $8 million to $10 million. That number is eye-watering even by Bugatti standards, but the real story here isn't the price tag. It's that this specific engine will never be built again.The Engine Bugatti Just RetiredEvery Bugatti hypercar since the original Veyron debuted in 2005 has been built around some version of the same architecture: a quad-turbocharged, 8.0-liter W16. The Mistral is the final chapter of that engine's production run. Bugatti's newer Tourbillon replaces it with a naturally aspirated, hybrid-assisted V16, trading forced induction for electric motors to fill in low-end torque, a shift driven as much by tightening emissions rules as by the desire for instant throttle response without turbo lag. Once Mistral production wraps, nobody will roll a new quad-turbo W16 out of Molsheim again.In this particular car, that engine makes 1,578 horsepower, enough for a 0-62 mph run in 2.6 seconds and a top speed of 260 mph, figures Broad Arrow markets as making this the fastest recorded production roadster on the planet. Only 99 Mistrals were built, and this is one of them.Why Removing the Roof Costs More Than It SavesThe Mistral isn't simply a Chiron with the roof lopped off, even though that's effectively what it is underneath. Cutting a roof off any car removes a huge chunk of the structure's torsional rigidity, and Bugatti had to re-engineer the chassis, sills, and windshield surround to claw that stiffness back without piling on weight. That's part of why open-top hypercars routinely cost more to develop, and more to buy, than the coupes they're derived from, a pattern that shows up again in this same sale with a 2011 Bugatti Veyron 16.4 Grand Sport, the model that first proved Bugatti could pull off a targa-top hypercar back in 2008. That Veyron carries its own presale estimate of $3.25 million to $3.75 million, one of just 150 ever built and shown with 8,595 miles at cataloging.What $650,000 in Options Actually Looks LikeThe consigned Mistral's spec sheet reads like a highlight reel of Bugatti's configurator. Matt Argent paint sits over a Black Carbon lower body, the cabin mixes Beluga Black with Tangerine leather, and Bugatti Light Blue Sport accents run throughout, a combination Broad Arrow says represents roughly $650,000 in bespoke options above the car's base price. It was also recently serviced at Bugatti Beverly Hills, a detail that matters more than it might seem.Why Low Mileage Isn't Automatically Great NewsA car with 652 miles on the odometer sounds like an unambiguous positive, but turbocharged engines don't actually like sitting still. Long stretches of inactivity let oil drain away from turbo bearings, rubber seals harden, and fuel can start to break down in the lines, all of which can cause more trouble at start-up than regular driving would. That's why documented, regular service, like the Bugatti Beverly Hills visit noted in the listing, tells a buyer more about a car's real condition than the odometer does. It's also why serious buyers at this price point typically carry agreed-value insurance policies rather than standard auto coverage, since a conventional policy would never come close to replacing a one-of-99 hypercar at actual cash value.The Rest of the Card Isn't FillerThe Mistral headlines a lineup that includes a 2023 Hennessey Venom F5 Revolution Coupe, one of 24 built, making 1,817 horsepower and estimated at $2.9 million to $3.2 million, plus a Venom F5 Roadster leading The Collector's Reserve, a 15-car single-owner group being sold largely without reserve. A 2017 Ferrari F12tdf, one of the last front-engined Ferraris styled with Pininfarina, carries an estimate of $3.3 million to $3.8 million. A 2019 McLaren Senna is also going under the hammer, estimated at $2.35 million to $2.85 million, and it's one of only three built with the McLaren F1 FINA tribute livery, a nod to the F1 GTR Longtail that Nelson Piquet drove at the 1997 24 Hours of Le Mans. Broad Arrow paired it with a piece of racing history that has nothing to do with hypercars at all: a 1982 Ralt RT3, the actual Formula 3 car Ayrton Senna drove to a win in his first-ever F3 race, estimated at $500,000 to $700,000.A Newer Auction House Swinging for the FencesBroad Arrow only launched in 2021, and this marks the first time it's running The Quail Auction as that event's official sale, a real statement for an auction house still building its name against houses that have run Monterey week sales for decades. Alexander Weaver, Broad Arrow's VP and senior car specialist, framed the lineup as offering buyers "the most visceral driving experiences today's technology can afford." Nearly 200 cars will cross the block across the two-day sale at The Quail Golf Club in Carmel, California, but the Mistral is the one that will decide how the week gets remembered.AdvertisementAdvertisementIt's worth keeping the wider market in view here, too. Modern hypercars with vanishingly low mileage and heavily optioned spec sheets have been appreciating well past their original sticker prices in recent years, and a clean, documented Mistral with this kind of provenance could end up setting the tone for how Bugatti's last quad-turbo car gets valued for years to come.Related ReadingSomeone Wants $12 Million for a Bugatti Divo, or Roughly Double What It Cost NewThe One-Off Mansory Bugatti Veyron Vivere Diamond Edition Is ExtraordinaryAyrton Senna's First F1 Car Is Heading to Auction and It Could Sell for MillionsAdvertisementAdvertisementSenna's 1991 Brazilian GP-Winning McLaren Could Fetch $15 Million at Auction
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