Roush Supercharger Upgrade Kit 675HP Phase 2 to Phase 3 Mustang GT With Manual Transmission 2011-2014



  • Delivers 675 Horsepower
  • Delivers 585 ft/lb of Torque
  • Plug-and-Play Wiring
  • No Cutting/Splicing Required
MSRP $1,200.99
You save $1.00

Roush Phase 2 to Phase 3 675HP Supercharger Upgrade Kit for 2011, 2012, 2013 and 2014 GT Mustangs with a Roush Supercharger and Manual Transmission.

Looking to increase the horsepower of your 2011-2014 GT Mustang with a Phase 2 Roush supercharger? Well, it doesn’t get any easier than this Roush Phase 2 to Phase 3 675HP Supercharger Upgrade Kit (421597) from CJ Pony Parts! Plug-n-Play harness and bolt-on 80mm supercharger pulley make for an easy install with easy power gains.

Features and Benefits:
- Delivers 675 horsepower
- Delivers 585 ft/lb of torque
- Plug-and-play wiring
- Protects against possible engine damage
- Requires no splicing or cutting
- For manual transmissions only

Roush's Phase 3 Supercharger Upgrade Kit is calibrated to deliver 675 hp and 585 ft/lb of torque. This power-adder upgrade increases your 625 hp/525 ft/lb Phase 2 Roushcharged Mustang for more tire spinning fun! High horsepower can't be made without the proper supporting modifications and Roush made sure to take care of everything. A fuel pump voltage regulator and plug-n-play wiring harness were developed to help protect against extreme fuel-to-air changes and possible engine damage. The plug-n-play wiring harness allows for easy installation or removal if the kit ever needs to be removed. No cutting or splicing of factory wiring or harness is required!

Primary Components Include:
- 80mm Supercharger pulley
- Roush fuel pump voltage regulator
- Roush plug-n-play wiring harness
- Unique Roush PCM calibration

Vehicle Fitment:
- 2011-2014 GT Mustang with Manual Transmission

*Does NOT fit the Boss 302.

ATTENTION: Updated Operating System Requirements for the Roush Diagnostic Tool (RDT). The Technical Service Bulletin TSB 21-0802-AA has been issued by Roush. As of September 10, 2021, Windows 10 will be the ONLY operating system that will be supported by Roush Performance for the Roush Diagnostic Tool (RDT). Older operating systems, such as Windows 7 or earlier Windows operating systems (XP, Vista, etc.), will not be supported. All instances of RDT will need to be updated to the most current release. All previous versions of RDT will NOT be able to program or configure modules due to a software license time-out.

The updated minimum recommended PC Hardware Configuration will be:
- Processor minimum: 2.4 gigahertz (GHz) or greater Intel I5/I7 Dual Core
- Memory minimum: 4 gigabyte (GB) RAM or greater
- Windows 10
- Microsoft .NET Framework 4.0 or later

California Residents: Proposition 65 Warning

Note: This item is not CARB (California Air Resource Board) exempt and is not legal for sale or use in the state of California.

Vehicle Fitment

This product will fit the following Mustang years:

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