Ford Mustang Obsidian SG-One

This Mustang is one of the most expensive project cars that have ever been made. Over $1.3 million was spent on this Ford Mustang Obsidian SG-One. The SG stands for the initials of the owner of this car, Steve Groat.

This modified 1967 Mustang is Steve Groat’s project. The Obsidian is its color and SG is Steve’s initial. Only one Mustang Obsidian SG was made – that’s the reason why they added “One” on its name.

Under its hood, twin air-to-air intercoolers are located on top of a 392 cu in small block Ford and it is paired with a Tremec TKO 600 5-speed transmission. This car has no shift lever; a Master Shift steering wheel-mounted paddle shifter was used. The awesome built on its engine produced 847hp and 770 lb-ft.

Ford Mustang Obsidian

A four point roll cage was used to reinforce its chassis and its floor was filled with aluminium belly pan. Obviously, this car’s body was heavily modified, its headlight was from 2005 Mustang and it has a full coil over suspension with three-link configuration.


Ford Mustang Obsidian SG-One by Steve Groat from El Cajon, CA

Obsidian Ford Mustang

Engine and Drive Train

  • Obsidian 392 cubic inch engine (351W based), 800+HP on pump gas
  • Big Stuff 3 fuel injection w/on-board computer mgt. & in-dash diagnostics
  • Rotrex C38-81 twin superchargers & Active twin blow off valves
  • Hogan custom aluminum intake manifold w/Viper twin throttle bodies
  • Spearco custom twin air to air intercoolers
  • Custom billet aluminum pulley system, radiator core support & firewall
  • Aeromotive fuel pump & custom alum. fuel tank (sumped & baffled)
  • Doug Thorley custom headers, custom dual exhaust & aluminum tips
  • Tremec TKO 600 5-speed manual w/Master Shift paddle shifters
  • Mittler Brothers 9″ fabricated rear end housing w/Currie 31-spline axles

Ford Mustang Obsidian engine


  • Integrated tubular chassis, 4-point hidden roll cage & 4-piece belly pan
  • Redesigned shock towers, rear frame rails, reinforced frame rails & jack pads
  • Lowered center of gravity (for high speed stability & aggressive look)
  • Engine & firewall have been pushed back (for better weight distribution)

Ford Mustang Obsidian SG-One hood

Suspension Brakes and Steering

  • RRS Phase 5 front coil over suspension (Koni shocks w/Eibach springs)
  • RRS rear 3-link coil over suspension w/torque Arm
  • Brembo 14″ 4-wheel disc brakes w/4-piston calipers
  • RRS power rack & pinion steering w/IDIDIT brushed tilt steering
  • Power Brake Service hydroboost power brakes

Ford Mustang Obsidian dashboard


  • 2-seat conversion w/seats/boxes pushed back (for a modern sports car feel)
  • Recaro custom ultra heated leather seats w/full lumbar support
  • 4-point safety harness system
  • Luxury carpeting, sound proofing & heat insulation
  • Electronic A/C, Electric Life power windows, door locks & 3-speed wipers
  • Kicker 3,000 watt sound system w/5.1 Dolby digital surround sound
  • DVD GPS Navigation, XM Radio, MP3, WMA, iPod, Bluetooth, 60 Gig hard drive, Mobile Wi-Fi Internet, HomeLink & more
  • 5″ LCD touch screen monitor
  • Keyless ignition, remote keyless entry & vehicle security system
  • Stewart Warner gauges w/chameleon light package
  • Hand crafted color matched dash board extends several inches over stock
  • Hand crafted 2-piece door panels, headliner, center console & rear panels
  • Leather wrapped billet steering wheel w/manual paddle shifters
  • Lokar billet pedals & various billet accessories

Ford Obsidian wheels

Reference and photo credits




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