• ROUSH 2015-2017 Ford Mustang Phase 1-to-Phase 2 727HP Supercharger Upgrade Kit 421994 421994 Photo - Unmounted
  • ROUSH 2015-2017 Ford Mustang Phase 1-to-Phase 2 727HP Supercharger Upgrade Kit 421994 421994 Logo Image
  • ROUSH 2015-2017 Ford Mustang Phase 1-to-Phase 2 727HP Supercharger Upgrade Kit 421994 421994 User 1
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Roush Performance

ROUSH 2015-2017 Ford Mustang Phase 1-to-Phase 2 727HP Supercharger Upgrade Kit 421994

ROUSH 2015-2017 Ford Mustang Phase 1-to-Phase 2 727HP Supercharger Upgrade Kit 421994

$1,019.99
$1,019.99
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Shipping & returns

Shipping details

In-stock orders are processed within 48 hours; transit time is additional.

International orders include export processing and customs clearance. Duties, taxes and brokerage are extra; final freight charges may change after remeasurement.

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Returns

Need help with a return? Request authorization within 30 days of delivery for eligible unused, uninstalled items. See details for exclusions and applicable fees.

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Return details & how to start

Request return authorization (RMA) within 30 days of delivery for eligible items. Keep items unused and uninstalled, with original packaging and accessories. Electronics, liquids, special orders and other categories are excluded.

Email sales@frsport.com with RETURN and your order number in the subject to request an RMA. Please wait for return authorization before sending your item back.

Wrong part/size or change of mind: a 20% return processing fee applies, plus applicable shipping costs.

Original shipping is non-refundable. For orders shipped free, the actual outbound shipping cost is deducted from the refund. Return shipping is prepaid by the customer.

After payment capture, cancellations and refunds generally incur a 5% processing fee, except for our error, confirmed defects or confirmed carrier loss. The 5% and 20% fees do not stack; only the greater applicable fee applies. Store credit waives the 5% fee, but applicable return fees remain.

Missing, incorrect or transit-damaged items: report within 3 business days of receipt with photos of the product and packaging.

For defective items, contact us for help with the manufacturer's warranty process. The manufacturer decides the claim.

Specifications

Product details shared across all variants.

Product type
Supercharger Upgrade Kit
Category
Motor Vehicle Engine Parts
Item condition
New
Manufacturer type
Aftermarket
Shipping weight
11.3 lb
Barcode
844764006133

Billable shipping weight; may include dimensional weight.
Roush Forced Induction Components 421994 The ROUSH Phase 2 supercharger upgrade kit builds on the outstanding performance of our 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) NGK Spark Plugs and, RDT Reflash Voucher and Warranty. Note: 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. Note: If this system is installed on a 2015-17 ROUSH Stage 3 Mustang, the vehicle's powertrain warranty will be voided. 2015-17 Mustang Phase 1-to-Phase 2 Supercharger Upgrade Kit 627/670HP-to-727HP Note: Not approved for sale or installation in the state of California, or any other state that requires an EO number. ROUSH 2015-2017 Ford Mustang Phase 1-to-Phase 2 727HP Supercharger Upgrade Kit

Vehicle Fitments:

Year Make Model Submodel
2015 - 2016 Ford Mustang Base
2015 Ford Mustang GT 50 Years Limited Edition
2015 - 2017 Ford Mustang Shelby GT350, EcoBoost, V6, GT Premium, EcoBoost Premium, GT, Shelby GT350R
2017 Ford Mustang V8
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Vehicle fitment