PLEASE NOTE: Due to tremendous demand, your order may be delayed up to 4-8 weeks. If you’d like to speak to us about timing on a specific product or order, please call 1-800-59-ROUSH or send us a note in the chat below. Thank you for your patience!

2015-2017 ROUSH Mustang Phase 1 to Phase 2 Supercharger Upgrade Kit - 727 HP

Part #: 421994

$1,299.99
Free Shipping
Application: Mustang 2015-2017
Installation Difficulty:
Intermediate ?
Need help installing? Locate a dealership
Live outside the U.S.?

International Purchases & Shipping

Prices stated here are only for sales within the continental United States and ordered via the ROUSHperformance.com web site. Prices for other territories and countries may vary due to shipping fees, duties, and other factors.

Orders placed via ROUSHperformance.com can only be shipped to areas within the continental U.S. If you live outside the U.S., please orders must be placed through an authorized ROUSH dealer.

ASK A PERFORMANCE EXPERT
Our experts are ready to help!
800-597-6874ChatEmail

Product highlights for the 2015-2017 ROUSH Mustang Phase 1 to Phase 2 Supercharger Upgrade Kit - 727 HP:

  • 727 hp @ 6,850rpm and 610 lb-ft @ 5,100rpm
  • Preset plug and play digital fuel pump controller safely and reliably increases fuel pump output without opening fuel system
  • Cooler heat range Ford spark plugs help ensure complete combustion without detonation under the higher boost levels of Phase 2
  • Smaller diameter 80 mm pulley increases boost, installs in minutes, requiring no belt replacement
  • ROUSH/Ford Racing Phase 2 calibration file delivered with exclusive ROUSH Diagnostic Tool (RDT)
  • Includes 3-year/36,000-mile ROUSH Parts only limited warranty
  • Voids optional Roush limited Powertrain/Drivetrain warranties
  • 50-State emissions-legal on 2015-2016 Mustangs (CARB E.O. #D-418-29). APPROVED for sale or installation on 2017 model year in the state of California (CARB E.O. #D-418-34)

The ROUSH Phase 2 supercharger upgrade kit builds on the outstanding performance of our 2015-2017 Phase 1 supercharger system by adding proven core components and careful calibration, for an additional 57 horsepower and 65 lb-ft of torque over our 670 hp/ 545 lb-ft system (PN 421823).

The result is an outstanding 727 hp / 610 lb-ft of torque while retaining the daily confidence you expect from the engineering of ROUSH Performance.

ROUSH engineers spend hundreds of hours in the laboratory, on the dyno, and out in the field to ensure the components and calibration deliver consistent performance in all conditions.

The upgrade installs easily with a preset plug and play fuel pump controller, colder heat range spark plugs, and a higher boost 80 mm supercharger pulley. A ROUSH Diagnostic Tool (RDT) reflash voucher is in the box, and your upgraded Phase 2 calibration can be downloaded to your ECU in minutes by your dealer.

Included in the Kit:

  • Fuel pump controller
  • 80mm Supercharger Pulley
  • (8) Ford Spark Plugs
  • RDT Reflash Voucher

Warranty

50-State emissions-legal on 2015-2016 Mustangs (CARB E.O. #D-418-29). APPROVED for sale or installation on 2017 model year in the state of California (CARB E.O. #D-418-34)

This kit comes with an extended parts warranty (ROUSH Supplied Parts Only), which is good for 3 years or 36,000 miles from the date of retail purchase. Please note that if this system is installed on a 2015-2017 ROUSH Stage 3 Mustang, the vehicle's powertrain warranty will be voided.

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
Application Mustang 2015-2017
Difficulty Intermediate
Time 3 hours
Tools Basic tools
Instruction URL Download Instruction Manual