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Procharger Stage II Intercooled Supercharger Kit (99-04 GT)

Item 80818
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      Product Information

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


      • 60-70% Horsepower Increase
      • P-1SC Supercharger
      • 8-10 psi of Boost
      • 3-Core Air-To-Air Intercooler Included
      • CARB EO # D-365-5
      • Designed for Stock Applications Only
      • Fits 1999-2004 GT and Bullitt Mustangs


      More Horsepower! The stock GT Mustang came with a decent 260 Horsepower and 302 lb/ft of Torque from the factory, but after installation a ProCharger-equipped 4.6L GT Mustang can make 60-70% more horsepower at the flywheel. Thanks to the industry's coolest charge air temperatures, the unmatched power gains are delivered with maximum reliability and everyday drivability.

      High Capacity Intercooler. If you have the desire to continue modding your Mustang even after adding a ProCharger Supercharger, then this is the Kit for you. The 3-core air-to-air intercooler included with the Stage II Kit has a higher capacity than the High Output (HO) Kit. This Stage II kit will accommodate additional modifications as you continue to transform your Mustang into the highest horsepower beast possible.

      Supercharger Kit.
      The ProCharger Stage II Intercooled System comes 100% complete, and includes ProCharger self-contained supercharger, air-to-air intercooler, intercooler tubing, brackets, 39 lb/hr fuel injectors and ProFlow bypass valve.

      CARB Certified.
      Best of all this ProCharger High Output Intercooled Supercharger System is 50-state smog legal under CARB EO # D-365-5.

      This ProCharger Stage II Intercooled Supercharger System is specifically designed for use on the 1999 to 2004 GT and Bullitt Mustangs equipped with the 2 valve 4.6L modular engine.

      Technical Note. This Complete Supercharger Kit is designed to be used on stock applications, as Procharger will only provide a tune for the stock motor with stock exhaust or most aftermarket axle-back and cat-back exhaust systems. If your vehicle is no longer stock and has been upgraded with an aftermarket throttle body, cold air intake, headers, off-road mid-pipe, etc..., Procharger will not be able to provide a tune for your modifications. For modified vehicles, it would be best to purchase a Tuner Supercharger Kit so you can have a local Dyno Shop custom tune your vehicle with your aftermarket upgrades.

      Please Note. Procharger Supercharger Systems are built to order for our customers and accordingly, we require you to submit additional information about your vehicle using this form. Because of this there is a 14 day lead time on orders once your information is received.

      Once the Customer Information Form is filled out, please email it to with your Order Number in the Subject line, so the order can be processed.

      Fitment: 1999 2000 2001 2002 2003 2004 Details

      MPN# 1FE211-SCI

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (6)

      Write a Review

      Ratings Summary

      4.5 out of 5 overall rating from 6 customers

      Installation Time: Full Day

      • December 24, 2019

        3 2004 GT - JustinD Installation Time: Full Day

        Don’t buy from AM

        American muscle scammed me on this price changed it after I purchased than refused to give me the difference, buy directly from procharger

        Helpful (3)
      • September 28, 2019

        4 2002 GT - jhjj Installation Time: Weekend

        Good quality kit, additonal mods required

        Kit install itself was pretty easy. The procharger pulley sits VERY close to the aternator even after proper clocking and bracket adjustment etc. Only compaint is one support bracket out of threaded rod and locking bolts that presses against the back of the procharger right at the top of the engine. I feel like prcharger could have machined something a bit nicer as a solution to this especially since its visible right at the very top. Great gains as long as supporting mods and a good tune are in place.

        Helpful (1)
      • May 17, 2017

        5 2000 GT - DavidC Installation Time: Weekend


        This is a very involved install. Make sure you follow the directions to the letter. From taking your gas tank out to change the fuel pump to cutting and grinding to make things fit. Had a great time working through the install with the old man. At the end of the day it was totally worth the time and effort. This kit really makes the 2 valve come alive. I couldn't imagine running with out it. From the sound to the power it makes. Getting some serious smiles per gallon.

        Helpful (35)
      • May 18, 2016

        5 2003 GT - jason Installation Time: Afternoon

        great product

        super easy to install, no problems at all and made my car 2x faster

        Helpful (19)
      • March 05, 2014

        5 2002 GT - Pritch Installation Time: Weekend

        Simply AMAZING!!!

        I LOVE my Procharger on my 2002 Mustang GT! Putting down 412 RWHP and 419 FT LBS of torque on a moderate tune right now I couldn't be happier! Installation was a huge pain In my butt lol there was plenty of blood sweat tears and swear words involved, but it was so much more worth it in the end! The tune that it comes with from diablosport does run a little bit lean, so I would make sure before you buy the kit that you can take it up to have it Dyno tuned soon after the install. Also, the fuel pump that is included in this kit is a little bit better than the stock pump, but it still does not do the job that is required from the 39# injectors that come in the kit as well. So buy a Kenne Bell Boost-a-pump to make sure that the engine is getting the required ammount of fuel it needs. ALSO, the kit isn't just drop in and go. At least on my car, there were some very tight fits that needed to be grinded down or cut off, etc. it's not a very easy job! Just keep that in mind. But overall, I seriously could not be happier! Totally worth the money, and I wiould defiantly recommend it to anybody looking to boost their New Edge GT.

        Helpful (44)
      • December 05, 2012

        5 2001 GT - muscleboy Installation Time: Full Day

        proCharger Stage II Intercooled Supercharger System

        i installed this procharger my self there was a few unessesary words involved but i got her in and boy did i not regret it. this procharger really have me a diffrence lets just say it made my dream come true to have a 9.6 second car.

        Helpful (57)

      Questions & Answers (45 answers)

      5 Top Rated Questions

      how much hp will this supercharger add? an number not 70%

      • 70% of 260 bud

      Helpful (19) Show 2 more answers

      Should I get my engine rebuilt before installing this? I have a 2001 GT, it's got 134,000 miles on it but theres nothing wrong with it and it hasn't been driven hard. Would it be a good idea to get my engine rebuilt first?

      • I think that you should probably have a few things checked like compression in the cylinders and a leak down test to see what condition the valves and guides are in.If there is a weak spot the super charger will find it. The rings and rod bearings take the brunt of the increased force as does the head gasket. If your engine is as tight as you say it is you may be ok. But check to be sure.

      Helpful (15) Show 2 more answers

      I am confused about something, I read" "Designed for Stock Applications Only" and "If you have the desire to continue modding your Mustang even after adding a ProCharger Supercharger, then this is the Kit for you. This Stage II kit will accommodate additional modifications as you continue to transform your Mustang into the highest horsepower beast possible." This is contradicting, how can you add mods if this was designed for stock application only?

      • The Procharger Stage II Intercooled Supercharger System is designed to work with stock, and close to stock applications, but has the capability of supporting additional modifications. installing additional modifications will require a dyno tune, and depending on what modifications are added, fuel system upgrades may also be required.

      Helpful (10)

      I have a 2002 stage 2 Roush gt, is this supercharger going to be able to be put on? I know that the stage 2 doesn’t do much engine work other than the cold air induction and is more of a suspension upgrade and side exhaust, but after seeing that it works best with stock i have no clue haha

      • The Procharger Stage II Intercooled Supercharger System will physically install onto the Stage 2 Roush Mustang, but we recommend contacting Procharger to ensure they can offer a tune for your Roush.

      Helpful (4)

      supercharger do i need to remove my underdrive pulleys and go back to stock To install this supercharger

      • Absolutely! The underdrive is a plus when NA. But, when SC the UDPs are a negative as the blower spins slower. Plus the tune included is assuming that at a certain RPM and the provided pulley on the SC you are making at an approximate boost level. Also, the included belt assumes a stock engine damper/pulley. Put the stock pulley back on and sell your UDPs on Ebay. That's what I did when i went FI. By the way you will LOVE this centri blower. Makes boost linearly and is very easy to control vs the roots type. Easier on the internals. Better mileage, too. Good luck on your choice!

      Helpful (4) Show 1 more answer
      10 More Questions
      What happens if i already have a NOS kit? I have a 2002 GT, the engine is still pretty much new (only 30,000 miles on it).Will it be possible to use both the procharger and the NOS? Will I have to buy any extra parts so my car can handle all that HP? I'm not sure if that much pressure will damage my engine (still want to use her as my daily drive) or will I have to do something to my back axle to handle the HP? 1 answer
      Would it work for 73mm throttle bodie or would I have to go back stock? Also if I put everything stock and put this on would I need to get it dt I tuned? 1 answer
      I have a 2002 Saleen Mustang and just wanted to know if this is something that could be put into my car or if it has to be a regular GT mustang? 1 answer
      Will I pass smog in California with this kit? 1 answer
      I have 01 mustang gt automatic with about 68,000 miles and everything is stock would this supercharger be safe for my motor considering it’s all stock or should I get it checked out before installing? 1 answer
      So, I'm planning on getting a supercharger for my 03 GT and am really torn between either this setup or a 2.1 Kenne bell. I've read tons of forums and asked many peoples opinions and have gotten a jumbled bunch of answer. What would you guys recommend and what would be your guys honest assessment on centrifugal vs. twin screw blowers? 1 answer
      I have a 2001 mustang gt automatic and it has 177600 miles but we have rebuilt some part of the engine. Do you think my car will support this procharger? 1 answer
      On a scale of one to ten, what is the diffuiculty of installing this? 1 answer
      Will this work on my 04 automatic mustang gt? Or do I have to have a manual transmission? 1 answer
      Will this work on the 2001 4.6l 2v crown Victoria. 1 answer

      Installation & What's in the Box

      Installation Info

      Tech Specs

      • P-1SC self contained supercharger
      • Boost (PSIG): 8-10
      • Includes 3 Core Air-to-Air Inter Cooler
      • Includes 39 lb/hr fuel injectors
      • Includes ProFlow bypass valve
      • Includes intercooler tubing and brackets
      • Professional Installation Recommended

      Will It Fit My Mustang

      • Bullitt - 01
      • GT - 99, 00, 01, 02, 03, 04

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