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Roush Phase 1 to Phase 3 Supercharger Upgrade Kit (11-14 GT)

Item 69136
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      Review & Installation Video

      Product Information

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


      • Upgrade to 675 Horsepower and 585 lb-ft of Torque
      • Includes 3 Year / 36,000 Mile Limited Warranty on Roush Parts Only
      • Roush PCM Flash Voucher Card Included
      • Fits 2011-2014 Manual GT Mustangs with Roush Phase 1 Supercharger Installed


      More Horsepower! Increase the power of your Roush Phase 1 supercharger to an impressive 675 horsepower and 585 lb-ft of torque with a Phase 1 to Phase 3 Supercharger Upgrade Kit. That's an increase of 100 horsepower and 80 lb-ft of torque.

      Kit Includes. The Roush Phase 1 to Phase 3 Supercharger Upgrade Kit includes a new 80mm Supercharger Pulley, Fuel Pump Voltage Regulator with Plug-n-Play wiring harness, Cold air intake with 110mm MAF, 2085mm 6-rib serpentine belt, 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 includes a limited 3 year / 36,000 mile warranty on the Roush parts only.

      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 1 to Phase 3 Supercharger Upgrade Kit works for 2011-2014 GT Mustangs with the Roush Phase 1 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# 421596

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (4)

      Write a Review

      Ratings Summary

      5.0 out of 5 overall rating from 4 customers

      Installation Time: Afternoon

      • June 06, 2018

        5 2013 GT - Christopher Installation Time: Afternoon

        Awesome Upgrade, Buy now!!

        Highly recommend this product! It only took me a few hours in my garage and was fairly simple to install. I’m a little short, so I had to climb into trunk in order to drill the holes required. I thought about getting this for over a year and my only regret is not getting it sooner. Stop reading Buy NOW!

        Helpful (15)
      • April 27, 2017

        5 2014 Other - BernabeR Installation Time: Afternoon

        2014 roush stage 3

        Got this kit install it about 4 hrs and got some delete cats from pipes and dyno tune got 665 whp I'm happy with the hp increase I recommend to buy this kit for any 5.0

        Helpful (21)
      • June 10, 2016

        5 2013 GT - Happy Installation Time: Full Day

        Phase 1 to 3 upgrade

        Very happy with the upgrade. Fairly straight forward and simple install. I'm not a mechanic by any means but know my way around a car some. So anyone with basic skills can get this done. The power is awesome and the whine is hard to hide lol, it's very fun to drive. I thought it was a power house before... Now this things a straight beast!!! Well worth the money!!! I said full day to install but you can probably get it done in a little less, it took me 7 hrs but I'm slow and not used to being bent over under a hood... Back was killing me for a few days lol.

        Helpful (17)
      • January 25, 2014

        5 2013 Other - RS3ME Installation Time: Afternoon

        Holy ****!!!

        Let me start out by saying I'm writing this review from my iPhone, with my 18 month old daughter climbing all over me. Well, that said, I love this mod. I bought my 13 ROUSH stage 3 with the phase one supercharger in it from the dealer. It was nice and fast. It still wasn't fast enough to match the sticker price though so, I had to upgrade to the phase 3 supercharger. Within a month I got a gt 500 rear end (cuz I broke the stock one, don't ask) the phase 1 to phase 3 supercharger upgrade and a one piece aluminum drive shaft all from AM. I also bought an MGW short throw shifter (from MGW) cuz as we all know the stock one is garbage! Well I work at night and sleep during the day so, once I had all my parts my buddy had me drop off my car at his place where he installed everything, I mean everything within a few hours using basic hand tools. The PCM does require custom calibration by ROUSH so, you must remove it and ship it to them so they can tune it for you. It cost 80 bucks to ship overnight, but ROUSH was supposed to cover it, I just forgot about it literally until now, well ****! Anyway. From start to finish it was only three days. Roush is fast with that turn around. I'm in north Florida by the way. The performance gain was substantial and immediately noticeable! I've yet to have it dynoed due to the lack of shops near me (that I know of), but holy **** is it much faster now. As far as track time goes I'm sorry to disappoint anyone, but my work schedule doesn't really allow me to go, plus the only one near me is only an 1/8 mile track. Now, this isn't just my weekend car, it's my DD and as far as drivability goes it's awesome. It isn't noticeable until you get on it (the throttle I mean) and when you do, hold the **** on to her! My average MPG right now is overall since I bought the car, 13.9 MPG and my current average MPG according to my car is 14.2. I do drive like a maniac though, if that offends you well, I'll just go on living my life. Well, I hope this review was somewhat helpful. Once I dyno my car I'll post an update on my current hp/tq.

        Helpful (24)

      Questions & Answers (7 answers)

      5 Top Rated Questions

      Will stock Coyote motor be able to handle the power increase from Phase 1 to Phase 3? What, if any, other upgrades will be needed to handle that increase in power?

      • The stock coyote can handle the power from the Roush Phase 1 to Phase 3 Supercharger Upgrade Kit, however we do recommend upgrading the driveshaft, and for manual transmission vehicles, the clutch.

      Helpful (1)

      This kit says for manual transmission only. By looking at it's contents I don't see why it would not work on a automatic if getting it custom tuned from a performance shop and not using there tune. Does anyone know if this is the case?

      • The Roush Phase 1 to Phase 3 Supercharger Upgrade Kit will only fit Manual Mustangs.

      Helpful (0)


      • Yes, this kit will require a new tune due to the upgrades on the supercharger you have currently.

      Helpful (0)

      Is there a kit to change a 2001 Roush Phase 2 to a Phase 3?

      • Unfortunately, we do not have a kit for the 2001Roush that would change a phase 2 into a phase 3. You may be able to reach out to Roush Performance directly for a kit.

      Helpful (0)

      Why won’t this kit fit my 2005 phase 1 Roush? Is it the wiring or the shape of the air box or will this kit be in the way of the hood shutting?

      • The Roush Phase 1 to Phase 3 Supercharger Upgrade Kit is designed specifically for the 5.0L Coyote motor in the 2011-2014 Mustang, with the Roush supercharger kits designed for this setup. The Cold Air Intake, Fuel pump voltage regulator, belt, and PCM calibration would be incompatible, leaving only the pulley as a cross compatible part. 

      Helpful (0)
      Post Your Question
      2 More Questions
      After installion , Any wheel hopping or fish tailing etc. Thanks , David 1 answer
      Will this kit fit a 2010 mustang phase 1 Roush 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • Fuel Pump Voltage Regulator
      • Plug-n-Play wiring harness
      • Cold Air Intake System with 110mm MAF
      • 2085mm 6-rib Serpentine Belt
      • 80mm Supercharger Pulley
      • ROUSH PCM Flash Voucher Card
      • Installation Instructions

      Tech Specs

      Will It Fit My Mustang

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