What happens when you take a supercharged 2025 Mustang Dark Horse, pull the blower, and bolt on a Hellion Street Sleeperยฎ hidden twin turbo system? We ran the test the only fair way: same car, same Dynojet, back-to-back.
Round 1: Supercharged โ 670 RWHP
With the supercharger in place, the Dark Horse made 670 rear-wheel horsepower at 9.6 psi. A strong number, and our baseline.
The swap: blower out, turbos in
The supercharger came off, the stock intake manifold went back on, and the Hellion headers and Street Sleeperยฎ twin turbo system bolted in. The Sleeper keeps the turbos hidden for a clean, near-stock look under the hood, and it uses a crank-driven mechanical oil scavenge pump, so there is no electric pump, relay or wiring to fail.
Round 2: Same boost, +202 RWHP
Before turning anything up, we matched boost. At about 9.4 psi the twin turbos made 865 RWHP versus 663 supercharged: +202 horsepower at the same boost.
Turning it up: 1,219 RWHP
With boost raised to 16.9 psi, the Dark Horse laid down 1,219 RWHP and 908 lb-ft of torque. Boost is adjustable from the driverโs seat.
| ย | Boost | Rear-wheel HP |
|---|---|---|
| Supercharged | 9.6 psi | 670 |
| Supercharged (same-boost run) | 9.40 psi | 663 |
| Hellion twin turbo (same boost) | 9.46 psi | 865 |
| Hellion twin turbo (turned up) | 16.9 psi | 1,219 |
| Total gain | +549 RWHP (+82%) over the 670 baseline |
Get the kit
The Hellion 2024+ Mustang GT / Dark Horse Street Sleeperยฎ Twin Turbo System is the same kit on this dyno. Bolt-on, built in the USA.
Questions? Call or text 505-873-4670 or email sales@hellionturbo.com.
