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Stiegemeier Porting Services, LLC
2140 S. Old Hwy 94
St. Charles, MO 63303
(636) 949-2275


  Stage 5 -- 600 RWHP
  This stage consists of:
  • Stiegemeier tune specifically designed for the new 2007 GT 500.
  • Cold Air Intake.
  • Stiegemeier ported blower, throttle body and plenum
  • NGK spark plugs
  • Front Drive reconfigured for 2.2" pulley

    Superchips XCalibrator IICold Air IntakePorted blower, throttle body, and plenum

    Multi-stage Boost Kit
  Stage 5 Dyno results

Results were from a 2007 GT 500 Shelby with 250 miles on the odometer and stock exhaust.  The dyno results were obtained during winter weather, mid February and the horse power numbers are in STD scale.
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