Hellion Street Sleeper® Hidden Twin Turbo System (HT-1517-SS) - 2015-2017 Mustang GT

The Hellion Street Sleeper® Hidden Twin Turbo System is the ultimate expression of stealth performance for the 2015–2017 Mustang GT. Designed for enthusiasts who demand massive power without drawing attention, this system delivers industry-leading horsepower potential while keeping the engine bay and exterior appearance deceptively stock.

Hellion Turbo has been at the forefront of turbocharging innovation since 2004, building record-setting systems trusted by racers and street-driven power builds alike. Recognizing the growing demand for extreme horsepower combined with a true sleeper aesthetic, Hellion engineered the most innovative twin turbo system ever offered for the S550 Mustang — the Street Sleeper®.

Unlike traditional top-mount or front-facing turbo kits, the Street Sleeper® system places the turbochargers in a concealed location, maintaining a clean factory-style engine bay while still delivering crushing performance. Fully adjustable from as low as 5 psi to as high as 40 psi, this system supports power levels from approximately 600 horsepower to well over 2,000 horsepower depending on configuration. Simply put, this is the most powerful bolt-on system available for the Mustang GT.

No supercharger can compete with the scalability and efficiency of a Hellion twin turbo system. By harnessing spent exhaust energy rather than relying on belt-driven components, this setup eliminates parasitic losses and delivers more usable power to the rear wheels. The result is unmatched acceleration, higher trap speeds, and performance that continues to grow as your build evolves.

With over two decades of experience designing turbo systems, Hellion engineered the Street Sleeper® as a true bolt-on solution. There is no need to tap the oil pan or modify factory sheet metal, and most installations can be completed in under a day. The base system is offered as a tuner-style kit with entry-level turbochargers, while a wide range of upgrades are available including larger turbos, fuel system enhancements, and complete Blackout packages for those pushing the limits.

Every component is designed for durability, reliability, and long-term performance. From American-made stainless steel piping backed by a lifetime warranty, to Hellion’s industry-leading turbo oiling system, this kit is engineered to thrive under extreme boost conditions while maintaining street drivability.

Features

• Street Sleeper® hidden twin turbo system for 2015–2017 Mustang GT
• Stealth turbo placement for true sleeper appearance
• Boost adjustable from approximately 5 to 40 psi
• Horsepower capability from 600 to 2,000+ HP depending on configuration
• Multiple turbocharger options available:
  • 62/62 – 1,000+ HP
  • 62/62B – 1,200+ HP
  • 64/66R – 1,700+ HP
  • 68/70 – 2,000+ HP
• Large vertical-flow intercooler with high-efficiency bar-and-plate core
• (2) Turbosmart Comp-Gate 40 wastegates
• (2) Turbosmart VEE Port bypass valves
• American-made stainless steel piping with lifetime warranty
• Exclusive Hellion turbo oiling system
• Heavy-duty silicone couplers and stainless T-bolt clamps
• High-flow K&N air filters included
• Complete hardware kit and detailed installation instructions
• True bolt-on design with no oil pan tapping or sheet metal modification

Fitment

- 2015 Ford Mustang GT 5.0L
- 2016 Ford Mustang GT 5.0L
- 2017 Ford Mustang GT 5.0L

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