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Roush Phase 2 to Phase 3 Supercharger Upgrade Kit (11-14 GT)

Market Price $1,099.99 You Save 5% ($50.00)
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$1,049.99

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  • Item 69134
  • MPN# 421597

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Features & Details

  • Upgrade to 675 Horsepower and 585 lb-ft of Torque
  • Maintains Original 3 Year / 36,000 Mile Limited Warranty
  • Roush PCM Flash Voucher Card
  • Fits 2011-2014 Manual GT Mustangs with Roush Phase 2 Supercharger Installed
More Horsepower! Increase the power of your Roush Phase 2 Supercharger to an impressive 675 horsepower and 585 lb-ft of torque with a Phase 2 to Phase 3 Supercharger Upgrade Kit. That's an increase of 50 horsepower and 60 lb-ft of torque.

Kit Includes. The Roush Phase 2 to Phase 3 Supercharger Upgrade Kit includes a new 80mm Supercharger Pulley, Fuel Pump Voltage Regulator with Plug-n-Play wiring harness, a ROUSH PCM Flash Voucher Card and installation instructions.

Roush Performance quality - guaranteed. Roush is known for a rich tradition of excellent racing performance engineering at the highest level of OEM quality and design. This Supercharger upgrade kit maintains the original limited 3 year / 36,000 mile warranty.



Upgraded ROUSH PCM calibration. ROUSH® PCM calibration is a success of engineering that maximizes the power of the system. ROUSHcharger owners will receive a ROUSH® PCM Flash Voucher Card, which is used to obtain the specific calibration needed for your Mustang and requires ROUSH Diagnostic Tool (RDT) software and a J2534 Pass-Through device to upgrade your PCM (software and pass-through device not included).

Application. This Phase 2 to Phase 3 Supercharger Upgrade Kit works for 2011-2014 GT Mustangs with the Roush Phase 2 supercharger installed. Fits manual transmissions only. Does not fit BOSS 302 models. NOT approved for sale or installation in the state of California.

Fitment: 2011 2012 2013 2014 Details

What's in the Box
  • Fuel Pump Voltage Regulator
  • Plug-n-Play wiring harness
  • Bolt on 80mm Supercharger Pulley
  • ROUSH PCM Flash Voucher Card
  • Installation Instructions
Installation Info
Tech Specs
Will it fit my Mustang?
  • GT - 11, 12, 13, 14

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Customer Reviews (1) Write a Review

Overall Rating 5.0

out of 5 stars

Installation Time:Shop Install

Installation Cost:$100-$250

  • Performance Gain 5 5
  • Fit 5 5



  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    June 20, 2017

    Roush Phase 3 kit

    I was looking to increase my torque without installing long tube headers and figured this kit would be a nice start. As always, AM did an outstanding job in getting the kit to me; service was great! After installation, I had it on the dyno rack; 581 HP, 511 TQ. This was an increase of 21 HP and 67 TQ. The increase in torque is great and it seems that the gas mileage has improved a bit as well.

    IMASUDUK14

    Year: 2014 Submodel: GT

    Helpful (0)

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