Steeda Q850 Mustang Australia
Steeda Q850 Mustang Australia

Out of Production

The Most Powerful Production Mustang Available

The limited production Steeda Q850 StreetFighter™ Edition is the most uncompromising and best performing supercharged road car we have ever produced. Strategically engineered to meet the challenging expectations of the most demanding motorsports enthusiast, it is optimised for maximum performance on & off the track. The Q850 StreetFighter™ Edition offers appearance & performance that is best defined as being muscular, powerful and athletic. With 825 horsepower burbling beneath the hood waiting to be turned loose, the Steeda Q850 StreetFighter™ Edition delivers a combination of quickness, top speed, precise handling, and overall performance that is second to none.

Lose Your Innocence in 3.1 Seconds

The guiding Steeda principal is simple - Speed Matters®. Maximum Performance is achieved by a unique blend of More Power, More Traction, and More Refinement. For the Q850 StreetFighter™ Edition we’ve given it everything it needs – not just to survive on the street & racetrack – but to blow others away. From idle to redline, our special engine calibration starts where others left off – delivering a confident power that is rapid, responsive, and optimised for maximum performance. Throttle response is immediate and predictable and when coupled with our exclusive suspension and chassis modifications, you have the perfect combination of unrivalled performance for every twist and turn in the road ahead.

Argument Against Status Quo

Realising that power means nothing without stability and control, the Steeda G-Trac Suspension and chassis modifications have been strategically engineered to break the performance boundaries of the S550 Mustang platform. The result is a level of performance that makes for an unbeatable combination on the street, racetrack or drag strip – all without sacrifice or compromise.

A Sum Far Greater Than The Parts

We have undertaken unprecedented measures focusing on dramatically enhancing driving dynamics. We have developed the most comprehensive collection of suspension and chassis upgrades of any manufacturer in the market today – that when taken together, provide power and control on a master scale that is unmatched. The Steeda Q850 StreetFighter™ Edition a level of excitement and driving that delivers practically zero pitch and roll and a level of suspension refinement/performance that has never been experienced in a production Mustang before.

The fitment of lightweight staggered 20” wheels and Nitto NT555 G2 Ultra High Performance tyres round out the package and not only adds an aggressive look, but they also reduces un-sprung weight, further enhancing performance and providing a far superior level of car-to-road adhesion.

Aerodynamic Design

As speed increases, the air rapidly thins out – which is why attention to aerodynamics is so critical in a performance vehicle. Subtle, yet muscular in style, our Steeda aerodynamic changes are designed to function at speed. From the Steeda lowering springs that provide the optimum height for aerodynamic and suspension performance, the front fascia that provides minimum drag and the appropriate level of downforce (aiding the front tyres to get more grip and providing reduce understeer tendencies), to the rear spoiler that achieves the proper balance of downforce and drag. All of our aerodynamic enhancements not only improves the overall appearance of the car, but also it’s traction, grip, and lateral dynamics, which together hint at the car’s hunger for optimum performance.

The Math...

Horsepower: 825 | Torque: 640+ lb-ft
Top Speed: 183mph (295km/h) | 0-60 MPH: 3.1 seconds
Quarter Mile: 10.23 seconds at 146 mph | 0 - 100 - 0: 10.0 seconds

Hand-built with exquisite attention to detail and uniquely serialised, the 2018-2023 STEEDA Q850 is built by Mustang Motorsport under licence by Steeda Performance Vehicles.

Steeda Q850 - The Ultimate Power Experience

The Q850 is a modern legend, ready and eager to take on any challenge. A full array of strategically-engineered modifications elevate the iconic Mustang to a completely different level of rewarding performance. The exclusive Steeda G-Trac Suspension System, with its fully adjustable damping and specially-tuned components, provides an exhilarating driving experience and outstanding vehicle dynamics. Conceived as the ultimate performance Mustang and destined to reign supreme in the Pony Wars, the can be comfortably driven daily, but has all the necessary equipment to be a weekend warrior on the racetrack or drag-strip.


  • Steeda 5.0L V8 Supercharger Power Upgrade - 825 HP and 640 lb-ft of torque*
  • Steeda / Whipple 3.0L Stage 2 Supercharger System
  • Steeda High Flow Cold Air Intake System
  • Steeda Billet Oil Separator
  • Steeda Custom Performance PCM Calibration
  • Steeda / Ford Performance Severe Duty IRS Half-Shaft Upgrade
  • Steeda Tri-Ax Shifter (manual transmission vehicles only)
  • Steeda Black Aluminium Coolant Tank
  • Steeda Clutch Spring Assist and spring Perch Kit Upgrade (manual transmission vehicles only)
  • Steeda Engine Bay Serialisation Plate
  • Steeda Exterior Graphic and Badge Package
  • Steeda Aerodynamic Front Facia Enhancement Package
  • Steeda Aerodynamic Rear Spoiler
  • Steeda Rear Decklid Panel
  • Steeda Hood Strut Kit
  • Steeda Signature Q-Series Hood Blackout Treatment
  • Steeda Door Sill Plates with Q850 Model Identification
  • Steeda Q850 Dashboard Emblem
  • Stage II G/Trac "The Ultimate" Suspension Package
  • Steeda Dual Rate Ultimate Handling Springs
  • Steeda Front and Rear Sway Bars with "welded in place" solid Billet Ends
  • Steeda Billet Aluminium Front Sway Bar Mounts
  • Steeda Billet Aluminium Rear Sway Bar Mounts
  • Steeda IRS Subframe Bushing Support System
  • Steeda Adjustable Rear Toe Links
  • Steeda Billet aluminium Vertical Links
  • Steeda Extreme G-Trac K-Member Support Brace
  • Steeda Bump Steer Kit
  • Steeda Rear IRS Subframe Support Brace
  • Steeda Camber Plates
  • Steeda Ultra Lite Low Profile Jacking Rails
  • Steeda Pro-Active Performance Tuned Struts & Shocks
  • Steeda IRS Subframe Alignment Kit
  • Steeda Performance Wheel Alignment

  • McQueen Racing Wheels by Steeda - black (20” x 9” front, 20” x 10.5” rear)
  • Nitto NT555 G2 Ultra High Performance tyres with a staggered configuration features wider wheels in the rear to improve performance feel and intensify vehicle presence (275/35-20 front, 315/35-20 rear)

The Steeda Q-Series line of performance Mustangs offers something for everyone - the result of over 30+ years of uninterrupted Mustang performance engineering by Steeda Autosports. They are individually crafted with performance parts built in the USA under strict ISO 9001-2008 Compliant Standards and are available with a wide variety of special performance options to suit your specific needs.

Steeda reserves the right to adjust, alter and modify package content & pricing due to manufacturing shortages or other factors beyond our control.

*All horsepower & torque ratings are estimates of engine power based on engineering prototypes, and laboratory tests under optimum conditions using a minimum of 93 octane Premium Fuel. Actual figures may vary. Supercharged horsepower ratings are quoted from Whipple Superchargers ( and are 775HP (Stage 1) or 825HP (Stage 2). All power ratings listed are calculated crankshaft ratings based on RWHP readings from a chassis dynamometer. NOTE: When comparing RWHP ratings assume a 20%- 25% RWHP Dyno Correction Factor Chart to accommodate for transmission and drivetrain power losses. Additional factors to consider in the calculations include inherent vehicle powertrain variabilities, ambient temperature, relative humidity, altitude of the test location, etc.