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Roush R2300 550 HP Supercharger Kit - Phase 2 (05-09 GT w/ Manual Transmission)

Item 389811
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$7,035.99 (kit)

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      Product Information

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


      • Phase 2 Kit - 550 HP and 500 lb-ft at the Flywheel
      • ROUSH Phase 2 R2300 Supercharger
      • 80mm Supercharger Pulley
      • Single Belt Phase 2 Kit
      • ROUSH® Cold Air Intake System
      • Twin 60mm Electronic Throttle Body
      • Unique Fuel Rail with 52 Lb/Hr Fuel Injectors
      • Fits 2005-2009 GT's with a Manual Transmission Only


      Unleash 235 More Horses. Stock the 2005-2009 4.6L 3V V8 GT Mustangs come with an impressive 315 Horsepower and 325 lb/ft of Torque from the factory, but with a Roush R2300 Single Belt Phase 2 Supercharger kit installed the numbers jump to an astounding 550 horsepower and 500 lb-ft of torque; that's 235 more than stock.

      Monstrous blower kit, Roush style. This complete package transforms your GT into a track-shredding beast. Comes with a 2.3L TVS® supercharger with black finish, upper and lower intake manifolds, an intercooler, a low temp radiator, the ROUSH® cold air intake system, a dual 60mm electronic throttle body, a 80mm bolt-on pulley and a unique fuel rail with 52 lb/hr fuel injectors.

      New High-flow Technology. The ROUSH Phase 2 R2300 supercharger features Eaton's new cutting edge Twin Vortices Series technology (TVS) rotating assembly that delivers more power and better fuel economy in a smaller package for uncompromising performance. This a roots-type, positive displacement supercharger features twin four-lobe rotors that are twisted 160-degrees to greatly enhance thermal efficiency, enabling higher volume capacity, and higher operational speeds.

      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). This kit also features the ROUSH® logo, showing that serious performance lies within when you raise your hood.

      Application. This Roush R2300 550HP Single Belt Phase 2 Supercharger Kit is specifically designed for use on 2005-2009 GT Mustangs equipped with the 4.6L 3V Modular V8 engine. Fits manual transmissions only. NOT approved for sale or installation in the state of California.

      Please Note. Roush Supercharger Systems are built to order for our customers and because of this, there can be a 2 to 4 week lead time on orders once your information is received.

      Fitment: 2005 2006 2007 2008 2009 Details

      MPN# 421100

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (6)

      Write a Review

      Ratings Summary

      4.7 out of 5 overall rating from 6 customers

      Installation Time: Shop Install

      Installation Cost: $500-$1000

      • April 22, 2019

        5 2007 GT - MikeR Installation Time: Shop Install Installation Cost: $500-$1000

        much more Hp Torque

        I up graded my 2007 Mustang GT from Phase 1 to the Phase 2 ,took it to Pro Dyno in Fort Mills S.C. they did the installation and a Custom Tune,,501 HP @ the wheels 504 Lbs. Torque ,,at one point they had it @ 540 HP ,but they tuned it back down to 501HP ,,just to be safe,,My car has 31,000 miles,,I will now have to up grade the clutch it's starting to slip a little in high gear ,

        Helpful (5)
      • November 29, 2017

        5 2006 GT - Ron Installation Time: Weekend

        Roush phase ll super charger.

        I installed the Roush phase 2 on my 06 G.T. Mine came with the dual fuel pump and a new driver and wiring harness. Everything was pretty strait forward except for the instructions for the fuel pump wiring harness which required some modifications to the factory harness and was not clearly spelled out. It all worked out well in the end. I recommend replacing the radiator and cooling fan to the GT 500 set up. It fit well with a couple of minor modifications. Excellent power upgrade. Clutch will be next.

        Helpful (12)
      • September 17, 2017

        5 2007 GT - Blade105 Installation Time: Weekend

        Throttle body fit

        The elbow supplied from Roush is drilled for the GT500 throttle body pattern. Therefore the BBK 62mm and FRPP 62mm will not fit without a spacer. If you use a spacer, try to find an open one that doesn't interfere with the airflow. The Factory GT500 TB is 60mm and the FRPP GT500 TB is 65mm. Unless you're running a fully built short block and a lot more boost, the 65mm is a waste of money.

        Helpful (12)
      • September 16, 2017

        3 2006 GT - MQuick5 Installation Time: Shop Install Installation Cost: $1000+

        Belt Fraying!

        After a couple short rides, my belt was fraying. I contacted installer, and 3 months later they told me it's normal according to Roush! I find this hard to believe, but Roush told me the same thing. Something like that is normal characteristics of that belt on a TVS 4.6l install? I'm looking for a better belt, to try to determine if it's a belt issue or install. All the S.C. car's I see at shows there belts look fine, while I have a rag hanging for a belt! In fact last showing I was at I over herd several people saying it's going to need a belt soon. Well I haven't even ran a tank of gas through it, and it's only seen 4500rps a couple times. So it's not like I'm taking it to the drag strip every weekend.

        Helpful (24)
      • May 16, 2017

        5 2009 GT - DavidB


        Supercharger is a awesome kid for a 4.6 plenty of power but getting the most expensive supercharger browse still charges you $100 even with the vector card

        Helpful (21)
      • March 21, 2016

        5 2006 GT - Felixpiloto Installation Time: Shop Install Installation Cost: $250-$500

        Great Supercharger kit

        I paid my mechanic to install it on my car, it took him like 6 hours to get it up and running. So far it has been a great experience it offers an enormous amount of power wich was the necessary that I needed. It comes with every single piece that you need screws everything you only need to have the tools which is why I took it to my mechanic.

        Helpful (20)

      Questions & Answers (30 answers)

      5 Top Rated Questions

      So I have a 2008 gt/cs with 60k miles and No mod has been done. Would it be better for me to get this phase 2 kit or just go with the phase 1 kit? I only ask because my internals are stock.

      • If you do not plan on building the motor and upgrading the internals, I would not recommend the Roush R2300 550HP Supercharger - Phase 2 Kit. Phase 1 would be a better, safer, option in your case.

      Helpful (8)

      Hello I have a 2006 mustang gt and I was wanting to get a supercharger, now what all should I upgrade if I wanted to get the roush R2300 Supercharger phase 2 kit? would I have to upgrade anything else, such as clutch and flywheel? or is there more that would be recommended to upgrade?

      • Depending on what kind of shape your clutch is in at the moment and how you drive determines how much longer it will last. I have been running this kit for about two years now on my stock clutch which was in fairly good shape to begin with and it is just starting to slip now (installing a new clutch as a winter project at the moment). My car had about 60K miles on it at the time of the Roush Supercharger install, and I have always been careful to let the clutch full engage before giving full power, which is probably why it lasted as long as it did. If you are going to be power shifting much at all, you will probably burn the clutch out in no time as this kit adds a significant amount of power over stock. Although the kit does not come with a fuel pump upgrade, I would probably add (I did) a 'Boost a Pump" for insurance (a lot of people go with the duel fuel pump from Ford racing, but is pricey) as the biggest engine killer when going to a supercharger kit is running lean because of inadequate fuel supply.

      Helpful (6)

      Is there any transmission work that has to be done to the car or can the stock transmission take the power?

      • Hello! You will likely need to upgrade your clutch to handle the new power from the Roush R2300 550HP Supercharger

      Helpful (3)

      From what I’ve researched, to upload the tune to the car, you have to take your computer out and send it Roush to have them upload your tune, and wait for them to send it back. Is that true with this kit? Or does a tune come with the kit in which customers can upload the tune from home?

      • You would not need to remove your computer to have the tune loaded. Any local Roush certified dealer or speed shop would be able to load that tune for you. We would recommend contacting your local dealer to see if they or a Roush certified dealer, or contact Roush to see if there are any Roush certified shops in your area.

      Helpful (1)

      Ok I need to be enlightened. So I have a 2008 gt/cs with 50k miles and a X pipe and roush extreme cat back exhaust. And that's it. No other mod has been done. Would it be better for me to get this phase 2 kit or just go with the phase 1 kit? I only ask because my internals are stock.

      • With the modifications you have and using stock internals, we would recommend going with the Roush R2300 475HP Supercharger - Phase 1 Kit- item 42154

      Helpful (1)
      10 More Questions
      Does this roush r2300 phase 2 kit come with a custom tune? 1 answer
      Will the Ford Performance Twin 62mm Throttle Body fit on this 1 answer
      Hello, I have a 2006 GT with 4,200 original miles and Ford Racing 4.10 gears. My Pony is like New. Do I have to make any internal changes to run this Supercharger right now? I will be upgrading to an Exedy Stage 2 Clutch, Exedy lightweight flywheel, one piece aluminum driveshaft rated at 900 HP, and the Ford Racing Dual fuel Pump Kit along with a Big Brake set up. Are the 4.10's too steep? I have seen vids of guys running 4.10's Supercharged and they love it. I have a Hurst Short Throw Shifter and I have toughened up the rear with a Whiteline Adjustable Panhard Bar, Whiteline Panhard Brace, Whiteline Lower Control Arms, Whiteline Relocation brackets being lowered, and an Eibach Anti-Roll/Sway bar kit front and rear. Can I do this? Thanks in advance AM or anyone who answers my question. 1 answer
      What internal upgrades for the motor would have to be done to add the ROUSH R2300 PHASE 2 thank you. 1 answer
      I have a 2005 Mustang Gt with FRPP hot rod cams. Do I I need to upgrade the connecting rods/heads/crankshaft? Or can I just use as is with my motor? 1 answer
      Will this work with stock internals? 0 answer
      If I install this kit, how do I control the boost being used since I have stock internals? 1 answer
      I have 2007 Roger stage 3 and what wondering how difficult it would be to swap the old supercharger for the new one 0 answer
      I have 2007 Roger stage 3 and what wondering how difficult it would be to swap the old supercharger for the new on 1 answer
      I have a GT with CAI GT500 throttle body , hot rods cams shorty headers and full exhaust , will my cams hurt this supercharger in terms of power gain 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • TVS2300 Supercharger
      • Upper Intake Manifold
      • Lower Intake Manifold
      • Low temp radiator
      • Intercooler
      • ROUSH cold air intake system
      • Dual 60mm electronic throttle body
      • Fuel rail with 52 lb/hr fuel injectors
      • 80mm bolt-on pulley
      • ROUSH PCM Flash Voucher Card
      • All necessary hardware
      • Installation Instructions

      Tech Specs

      Will It Fit My Mustang

      • Bullitt - 08, 09
      • GT - 05, 06, 07, 08, 09

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