The Ford Mustang is the most modified car in the United States, with an estimated 1.2 million modified Mustangs on American roads according to the Specialty Equipment Market Association (SEMA). From a dropped GT with a tune and exhaust to a 4-rotor Shelby with a full cage, Mustang builds span an enormous range of risk profiles. Getting the right insurance depends on correctly identifying where your build sits on that spectrum.

What Makes Mustang Insurance Different?

Mustangs have higher-than-average insurance rates even in stock form, due to:

• High theft rates (Mustangs are consistently in the top 10 most stolen cars)
• High single-car accident rates, particularly among younger drivers
• Wide availability of performance modifications increasing average power output
• Large enthusiast community increasing overall accident exposure

Common Mustang Modifications and Their Insurance Impact

Best Insurers for Modified Mustangs

• Hagerty — excellent for S550/S650 Mustangs with performance modifications, agreed value available
• Grundy — good for older Fox-body and SN95 builds, no mileage restrictions
• American Collectors — competitive on older and classic Mustangs (1965–2004)
• Heacock Classic — strong on purpose-built drag Mustangs with cage and slicks
• RLI Insurance — preferred for regular strip users needing annual motorsport coverage

Getting Agreed Value for Your Mustang Build

A supercharged S550 Mustang with full suspension work and drag prep can easily exceed $80,000–$120,000 in total build value. Standard market value of a base Mustang GT is $30,000–$45,000. The gap between what you’ve spent and what a standard policy pays is the reason agreed value insurance is essential for any serious Mustang build.

Mustang Track Day Endorsements

The Mustang is the most common car at track days and open lapping events in the US. Many Mustang-specific insurers offer track endorsements. Confirm that the endorsement explicitly covers street-legal Mustangs (with intact registration) running DOT tyres on a closed circuit, as some policies exclude anything with cage or harness equipment.