Roush Supercharger Upgrade Kit 550HP Phase 1 To Phase 2 Mustang 4.6L 2005-2009



  • Produces 550 Horsepower
  • 80mm Supercharger Pulley
  • GT500 Fuel System Upgrade
  • For 2005-2009 Mustang GTs
MSRP $1,499.99
You save 14%

Roush Phase 1 to Phase 2 550 Horsepower Supercharger Upgrade Kit for 2005, 2006, 2007, 2008 and 2009 Mustangs with a 4.6L Engine.

If you already love the Roush Phase 1 Supercharger in your 2005-2009 4.6L Mustang, then it's definitely time to continue your pony's upgrades! Order this Roush Phase 1 to Phase 2 550 Horsepower Supercharger Upgrade Kit (421101) from CJ Pony Parts today!

Features and Benefits:
- Sold as a complete kit!
- Provides more power and performance
- Increases to 550HP and 550 lb-ft of torque
- No double parts

This upgrade kit will allow current owners of the Roush Single Belt Phase 1 Supercharger (42110) to easily upgrade to the Phase 2 system for even more power and performance! You'll absolutely love the increase to 550HP and 550 lb-ft of torque, a definite increase over the Phase 1's 475HP. Roush took the time to develop their supercharger systems to be easy to upgrade--you can buy in at one phase in the line and upgrade later while reusing as many parts as possible from the kit that you already have! No double parts, no wasted money—instead you'll just need a few new pieces to help get your Mustang to the next performance level.

Kit Includes:
- GT500 Fuel System Upgrade
- 80mm Supercharger Pulley
- 6-rib Serpentine Belt
- Roush Flash Voucher Card

Tech Tip: This part now utilizes the Roush Flash Voucher card to be calibrated using Roush Diagnostic Tool (RDT) software and pass-thru device. If you do not have access to an approved pass-thru device, you can send your PCM back to Roush to be flashed for an additional fee.

Vehicle Fitment:
- 2005-2009 4.6L Mustang

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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