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

Item 69134
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      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • 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

      MPN# 421597

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (3)

      Write a Review

      Ratings Summary

      5 out of 5 overall rating from 3 customers

      Installation Time: Shop Install

      Installation Cost: $100-$250

      • June 29, 2019

        5 2011 GT - MauriceB

        Upgrade Kit

        Installed by Auto Nation Ford In Panama City,Florida it took one day to install just waiting to get a dyno tune to see how much more horsepower I will have

        Helpful (0)
      • October 13, 2018

        5 2014 GT - DemmetriusK

        Upgrade to stage 3

        I’ve upgraded to the stage 3 best money spent. Love the power it gave.

        Helpful (12)
      • June 20, 2017

        5 2014 GT - Imasduk68 Installation Time: Shop Install Installation Cost: $100-$250

        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.

        Helpful (16)

      Questions & Answers (1 answers)

      1 Top Rated Question

      Why is this available in Manual Transmission only? Would an auto transmission be affected if these items were installed? Or what upgrades can be done for additional HP from stage 2 to close to stage 3 power without compromising my auto trans. Thanks

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      Installation & What's in the Box

      Installation Info

      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

      Tech Specs

      Will It Fit My Mustang

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