2025 Mustang Boss 429 Horsepower. 2025 ford mustang boss 429. While winning races was the driving force behind the boss 429 engine, it only received a 375 horsepower rating in the mustang.

Find incentives, rebates, recalls, and warranty specifications here. The original was built off line at kar kraft, where they dropped in the boss to a special run of mustangs that were shock tower delete (minus engine/tranny & punkin).