Steeda Releases Build List On The 686 Horsepower 2015 S550 GT

Thanks to Steeda's Progressive Sport Springs, their GT has been lowered by 1.125" in the front and 1.00" in the rear, giving it a mean stance.

Thanks to Steeda’s Progressive Sport Springs, their GT has been lowered by 1.125″ in the front and 1.00″ in the rear, giving it a mean stance.

If you own one of the new S550 platform Mustangs and have wanted to build a fast-handling, badass, high horsepower GT, then look no further. Steeda has released the full details on their Q650, which is a Vortech V-3 Si supercharged 2015 Mustang GT putting down 686 hp to the rear wheels.

From its wide Steeda ST-R wheels in the rear to its Steeda front splitter – this GT has a mild, yet seriously menacing look and feel to it.

The build sheet shown below is almost a mile long, and every single part (other than the Vortech supercharger) is provided in-house by Steeda. The Q650 is made with parts that are available for anyone to purchase from the Steeda website. The car is making 686 hp to the rear wheels and 555 lb-ft of torque to the rear wheels on only 10 pounds of boost.

Trivia question: Can you tell what trim-level model this 5.0 is from the pictures?

The Q650 makes a ton of power, but it all means nothing if the car can’t handle it on the street or the track. Steeda remedies that situation by equipping the car with a massive amount of its suspension and other made in-house parts, and things only gets better from there.

The car is equipped with Steeda’s slotted front and rear brake rotors for adequate stopping power, and a 3-inch mandrel bent stainless steel Magnaflow catback exhaust provides that aggressive musclecar tone every Mustang owner seeks.

Recently Steeda had the car out at Sebring International Raceway for the Track Guys event. Steeda representatives say the Q650 is at home on the track, and it certainly sports the looks, horsepower and handling to go along with that statement. Now we’re wondering if they’d like to hand us the keys for an afternoon to do a first hand evaluation – one can only dream.

Steeda2GR

The Magnaflow catback exhaust looks right at home on Steeda’s 2015 GT

Check out the build list below if you’re looking to replicate Steeda’s Q650:

Suspension

  • Steeda Mustang Front Sway Bar (2015) 555-1015
  • Steeda Mustang Rear Sway Bar (2015) 555-1016
  • Steeda S550 Billet Rear Sway Bar Mounts (2015) 555-8147
  • Steeda S550 Billet Front Sway Bar Mounts (2015) 555-8148
  • Steeda Mustang Sport Springs – Progressive (2015 GT/V6 Coupe) 555-8210
  • Steeda S550 Mustang Adjustable Differential Bushing Insert System – Urethane (2015 All) 555-4439
  • Steeda Mustang Bumpsteer Kit (2015 All) 555-8133
  • Steeda S550 Mustang IRS Subframe Bushing Support System (2015 All) 555-4437
  • Steeda S550 Mustang IRS Subframe Alignment Kit (2015) 555-4438
  • Steeda S550 Mustang Rear IRS Subframe Braces (2015 Coupe) 555-5754
  • Steeda Adjustable Rear Toe Links (2015 All) 555-4120
  • Steeda S550 Mustang Steeda Billet Aluminum Vertical Links (2015) 555-4121

Drivetrain

  • Steeda S550 Mustang Shifter Base Bushing Bracket Kit (2015) 555-7092
  • Steeda S550 Mustang Tri-Ax Short Throw Shifter (2015 All) 555-7316
  • Steeda Mustang Heavy Duty Braided Clutch Line (2015 All) 555-7016
  • Steeda MT-82 Transmission Mount Bushing Insert (2011-2015) 555-4037

Engine

  • Vortech S550 Mustang Complete V-3 Si System – Black Finish (2015 GT)
  • Injector Dynamics ID1000’s
  • DeatschWerks DW400 In-Tank Fuel Pump

Brakes

  • Steeda 15″ Mustang Slotted Front Brake Rotors (2015) 555-6024
  • Steeda 13″ Mustang Slotted Rear Brake Rotors (2015) 555-6025

Exterior

  • Steeda S550 Front Splitter – Street (2015 GT w/ PP chin) 283-S550-GT-PP
  • Steeda S550 Functional Race Wing (2015 All) 476-STEEDA-WING-15
  • Steeda S550 Mustang Hood Strut Kit (2015 All) 555-0687

Exhaust

  • Steeda Magnaflow Mustang Street Cat-Back Exhaust 263-555-100

Chassis

  • Steeda Mustang Extreme G-Trac Brace (2015) 555-5532
  • Steeda Mustang Strut Tower Brace (2015 GT/EcoBoost) 555-5731

Wheels

  • 20×9.5 Steeda ST-R Wheel Black (2005-2015) 004-209501
  • 20×11 Steeda ST-R Wheel Black (2005-2015) 004-211501

Article Sources

About the author

Harrison Noble

Living in San Diego for most of his life, Harrison was exposed to a variety of cars at an early age. His passion for anything that is fast, or has a V8, brought him to Power Automedia.
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