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C$ 125,000

Porsche 997 GT3 Grand Am Cup - SOLD

Astom Martin F1 Show Car

This is now SOLD. Search for similar items.


This 997 is one of approximately 11 GT3 Cups built by the Porsche factory to Grand Am specifications in 2008 and has since been the recipient of a vast array of the best performance parts available for the 997 including: 997.2 rear wing on factory Cup S uprights, RSR exhaust, seam-welded suspension pickup points, carbon fenders, carbon bumpers, adjustable swaybars, and JRZ shocks.  Completing this formidable package is 3.8-liter engine built to the tune of 445hp at the wheels and a Bosch MS3 Sport Cup ECU with traction control.  This GT3 is ready to win races right now with nothing more than the push of the starter button.

This GT3 Grand Am Cup was purchased in 2008 by a front running team and campaigned for two seasons including the 24 Hours of Daytona and several other Grand Am events.  The car then sat, unused, from 2010 until Autometrics purchased it in 2012.

Once in the Autometrics Motorsports stable the GT3’s mechanicals were thoroughly inspected and freshened.  Underpans were removed and the car was steam cleaned from top to bottom.  All fluids were flushed, seals evaluated and replaced where necessary, and every last mechanical component inspected, cleaned and evaluated.  A laser-alignment and a corner weight adjustment were performed and the GT3 Grand Am Cup was then evaluated on-track where its setup was further refined and where the GT3 won regularly.

At this point, it was clear that the chassis was both fully-sorted and as good—or better—than anything else on track.  This GT3 easily kept up with and bested far more powerful Porsches despite the somewhat mild 3.6 liter it had retained since purchase.

The engine and transmission were then pulled, steam cleaned individually, and wheeled into the cleanroom.  Every component was then broken down to the last nut and bolt.  All internals were inspected, tested, and replaced if they showed the slightest flaw or wear.  Larger pistons and liners took the place of the old 3.6’s and everything was then reassembled to our highest 3.8-liter spec.  A new clutch was installed and the GT3’s original blue axles were replaced with large-flange RSR green axles and CV joints.  Completely reassembled this package made 445 SAE horsepower (at the wheels with the noise filter set at 3) on Dynojet chassis dyno. Finally, a Bosch MS3 Sport Cup ECU was added and programmed the GT3 to run with traction control.

With outstanding mechanical condition and an extremely high level of tune, this GT3 Grand Am Cup stands ready to win races.

The car was bought in 2015 and maintained since by GT Racing.


  • 3.8L Making 445HP
  • Bosch MS3 Sport Cup ECU


  • 6 speed sequential


  • FIA certified safty cage
  • 120-liter fuel cell
  • Air jack system
  • Light weight carbon bumper and fenders


  • Brembo Endurance Brake


  • JRZ coil over front and rear
  • Full adjust. suspension front and rear
  • Adjust. sway bar front and rear



  • 3set 11x18inch front wheels 300/650-18
  • 3set 13x18inch rear wheels  325/710-18



  • Motec ADL2 display
  • Mechanical 4.25 Ltr Fire Extinguisher system
  • FIA seat
  • FIA 6-point harness
  • Motorola Radio
  • Aim Smartycam



~1250kg empty (GT3 spec.)

Keyword Search Terms:

Porsche, Cup, Grand AM, 997, GT3

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