If you thought you’d seen every flavor of Mustang, think again. This 2025 GT RTR Spec 3 is a true oddball on the auction scene, dipped in that eye-catching Mystichrome paint that can’t decide what color it wants to be. Under the hood, you get the full Spec 3 treatment: a Whipple-supercharged 5.0-liter V8 cranking out 810 horsepower. With just 6,500 miles on the clock, a clean title, and all the right paperwork – including the RTR certificate and original window sticker – this one’s ready to turn heads and raise eyebrows.
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What It’s Worth Right Now
You won’t spot a 2025 RTR Spec 3 at auction every day. These specialty builds are a rare breed, and there’s not much public sales data yet for the latest S650 RTRs. Still, Classic.com keeps tabs on the previous-gen (2015-2023) Mustang RTRs, giving us at least a glimpse into how these wild ponies fare with collectors.
According to Classic.com, sixth-gen RTR Mustangs are currently pegged at a market benchmark of $42,857, with an average sale price hovering around $35,200. Good luck finding one, though – there are only a handful of comparable RTRs for sale right now, which just goes to show how seldom these cars pop up.
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But this car plays in a different league. It’s got the latest S650 bones, the top-dog Spec 3 package, barely any miles, and that elusive Mystichrome paint. Put it all together, and you’ve got one of the hottest modern RTR builds out there.
Condition and Details
Under the hood, you’ll find a supercharged 5.0-liter V8, courtesy of RTR’s Spec 3 wizardry. That means a Whipple supercharger, dual-pass intercooler, beefier fuel injectors, adjustable Tactical Performance suspension, sway bars you can dial in, RTR wheels, and the full body kit. RTR claims 810 horsepower, though there’s no dyno sheet to back it up.
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The Mustang also includes the GT Performance Package, leather upholstery, a 12.4-inch digital instrument cluster, a 13.2-inch touchscreen infotainment system, LED lighting, and ambient interior lighting. It is paired with a 10-speed automatic transmission sending power to the rear wheels.
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The seller says the car rolled off the lot brand new in May 2025 and has been pampered ever since, with paint protection film, ceramic coating, and tinted windows. You get two keys, the original RTR window sticker, certificate of authenticity, service records, the Whipple tuner, and the RTR suspension tool. Heads up: there’s still a loan on the car, but it’ll be squared away when the deal closes.
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The Offer
| Specification | Detail |
| Make | Ford |
| Model | Mustang GT RTR Spec 3 |
| Year | 2025 |
| Mileage | 6,500 miles |
| Engine | 5.0-liter supercharged V8 |
| Power | 810 horsepower (RTR claimed) |
| Transmission | 10-speed automatic |
| Drive Type | Rear-wheel drive |
| Exterior Color | Mystichrome |
| Interior Color | Black Onyx leather |
| Location | Kamas, Utah |
Interested in this Mustang GT RTR Spec 3? View the listing here.
What Makes the Mustang GT RTR Spec 3 Unique
RTR vehicles occupy a niche between a factory Mustang GT and a traditional aftermarket build. Created by RTR Vehicles in partnership with Ford and professional drift driver Vaughn Gittin Jr., Spec 3 models receive extensive performance upgrades while retaining a factory-like fit and finish. The package goes beyond cosmetic changes, adding forced induction, suspension upgrades, chassis tuning, and RTR-specific styling components.
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What really sets this car apart is the Mystichrome paint – a throwback to the legendary 2004 SVT Cobra. For 2025, Mystichrome is back as a pricey $14,995 option, and when you pair it with the RTR Spec 3 package, you get a combo that’s almost never seen, even among the wildest S650 Mustangs.
Final Thoughts
This Mustang is the best of both worlds: factory muscle meets RTR’s top-tier performance. With a claimed 810 horsepower, just 6,500 miles, and a stack of documentation, it ticks just about every box for anyone hunting a modern specialty Mustang.
Since there’s not much sales history for the latest RTR Mustangs, this auction should give us a clue about what collectors are willing to pay for a low-mileage Spec 3. With Mystichrome paint and all the RTR goodies, this is easily one of the most distinctive seventh-gen Mustangs you’ll find right now.
Disclaimer: This post is for informational purposes only. We are not a dealership or broker. All vehicle specifications, pricing, and availability are subject to change without notice. We are not responsible for typographical errors, omissions, or the accuracy of the provided information. Please verify all details directly with the seller.
About the author
Jacob Oliva
Senior Editor, Autoblog