Hellion 2018-2023 Ford Mustang GT Street Sleeper® Hidden Twin Turbo System

Sold by Boschma's Speed Shop, an authorized Hellion Turbo dealer. Kit options, turbo upgrades, tuning and lead time vary by build. Call us at 608-481-2789 or email bandbracing@sbcglobal.net before ordering so we can confirm the right setup for your vehicle.

Welcome to the page of the legendary Street Sleeper® Mustang twin turbo system, the gold standard of turbo kits.

Years ago, we recognized the popularity of huge horsepower cars with the ultimate “sleeper” image, Hellion designed the most innovative twin-turbo system in history — the Street Sleeper®! We have listened to our customers who desired a different design for the S550 Mustangs. This new system places the turbos in a hidden location. It is a twin-turbo system that is fully adjustable from 5 to 40 pounds of boost, and performance levels anywhere from 600 to over 2,000 horsepower!

This the the most powerful system available for the Mustang, period. No supercharger can even come close to the potential of a Hellion Twin Turbo. One of our most common conversations with our customers is "I'm pulling off my supercharger and purchasing a Hellion kit. I just can't keep up with other Hellion cars." You just can't beat the power of a twin turbo Mustang.

With over 25 years in building turbo systems, Hellion has designed a true bolt-on system for the S550. There is no need to tap the oil pan or modify any factory sheet metal. The simple installation can be performed in under a day in most cases.

While the base Street Sleeper® system is a tuner kit with entry-level 62mm turbos, Hellion naturally offers a massive number of available upgrades, including choice of turbo size, fuel system upgrades and even complete blackout packages.

The benefits of a twin turbo system go beyond the awesome looks and sounds of a pair of turbos–no other power adder can deliver the crushing power and torque a Hellion twin kit can.  While superchargers drag the engine down constantly with parasitic losses through a belt, a turbo setup uses spent exhaust energy to make boost–no extra losses!  This equals more power to the tires and faster times!

Equipped with:

• Multiple T4 turbo options available (62/62 1000+HP)  (62/62B 1200+ HP)  (64/66R 1700+ HP)  (68/70 2000+ HP)
• Large vertical flow core intercooler standard with the highest flow bar/plate core available — full sheet metal construction, built right here in America with gorgeous welding and craftmanship. No ugly knock offs here.
• Twin Turbosmart Comp-Gate 40 wastegates
• Twin Turbosmart VEE port bypass valves
• AMERICAN MADE Stainless steel piping (comes standard with a lifetime warranty)
• Heavy duty silicone hoses for all connections
• Stainless steel T-bolt clamps
• High flow K&N air filters
• Exclusive "industry leading" Hellion oiling system for turbochargers (NO annoying constant need to grease underperforming turbochargers or cheap electric pumps to fail)
• All necessary bolts, nuts, hardware needed for installation
• Complete instruction set to assist with at "at home" installations, supported by reliable Hellion customer service