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Steeda Billet Charge Motion Control Plates (05-08 GT)

44 Reviews
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  • Item #16162
  • MPN# 555-3125

  • Market Price $313.99
  • You Save 11% ($34.04)
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  • Gain 10+ HP
  • Improves Torque
  • More Midrange & Upper Rpm Power
  • CNC Machined Billet Aluminum
  • Installs Using Hand Tools
  • Fits 05-08 Mustang GT and 08 Bullitt
Gain 10+ HP. Replace your restrictive factory charge motion control plates with Steeda's free-flowing plates and enjoy more power and torque. These high performance plates add horsepower and torque in the mid to upper RPM ranges without sacrificing low end torque for the kind of tire-frying power you can feel. Peak gains of up to 10 horsepower have been seen on naturally aspirated Mustangs, and more power is possible from supercharged engines.

Designed to Perform. As used on Steeda's Q335 Mustang, these plates are 0.070 thicker than the factory plates and are a better port match to the intake manifold and cylinder heads than your OE plates to untap hidden horsepower. They also delete the factory butterfly flow control to reduce turbulence and increase airflow - and as everyone knows, more airflow equals more power.

Billet Aluminum. These premium quality plates are CNC machined for precision out of aircraft-quality 6061-T6 billet aluminum so they won't weigh you down.

Application. The Steeda Billet Motion Control Charge Plates are designed for the 2005 to 2008 Mustang GT and 2008 Bullitt with the 4.6L three valve V8 engine. These plates will require computer recalibration - we recommend a Mustang Handheld Tuner to reprogram the vehicles computer (ECU) for proper operation.

Note: Coupon codes cannot be applied to this product.

Note: As of the 2009 model year, Ford molded the charge motion plates into the stock intake manifold. So they are not changeable.

Fitment: 2005 2006 2007 2008 Details

What's in the Box
  • (2) Control plates
Installation Info
Will it fit my Mustang?
  • Bullitt - 08
  • GT - 05, 06, 07, 08

Does not fit 2009 models.

Most Helpful Reviews

Works great JLT CAI!

My car is an 07 manual GT, and I was very impressed with the gains I got from these. I have a JLT CAI that I've combined with a CDC shaker hood scoop, and these really work well with the new plates, especially ...

Read More
Helpful (1)

A Must-Have!

This is an absolutely necessary step. The restriction is removed! You should see the stock butterfly valve assembly with actuator motor... GOODBYE! These really made a difference. Of course, I had Bama ...

Read More
Helpful (10)

Overall Rating 4.7 out of 5 stars
Read All 44 Reviews

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5 Questions / 8 Answers

Ask a Question

Will these work in my 2008 with a ford racing intake manifold?


  • The Ford Racing High Performance Intake Manifold already deletes the charge motion plates so this product is unnecessary.


    Good Answer (2) (0)

Show 1 more answer Question Resolved

Will this throw an engine code? I'm wondering if it will make my engine light come on and also will it work with the ford racing manifold or does that manifold have it molded in?


  • the frpp intake does the same thing as this and you will see almost the same power increase. the frpp intake has a little more power over 5500 rpm, but not much. this part will save you alot of money and you wont be disappointed with your increase in power. i would only buy the frpp intake because it looks good and people love it at car shows. but to answer your question, you dont need these with your frpp intake, it does the same thing.


    Good Answer (4) (0)

Show 2 more answers Question Resolved

Will this work with the Ford racing intake manifold.


  • You do not need it with that intake. They do the same job; intake will net you a few more hp but will cost you much more. Unless you are boosting or just like the looks, I'd go for the cmcp. Just makes hp:$ sense.


    Good Answer (0) (0)

Answer This Question I need this answered (0) (1)

Are these neccessary with Ford Racing Whipple Supercharger installed?


  • The Steeda Billet Charge Motion Control Plates (05-08 GT) are not required when installing a Whipple Supercharger. You can add them or delete them. Though, deleting them may give you a better increase in power.


    Good Answer (0) (0)

Question Resolved



  • The Steeda Billet Charge Motion Control Plates (05-08 GT) will only be compatible with the factory intake manifold. They will not be compatible with a roots style blower.


    Good Answer (0) (0)

Question Resolved

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Customer Reviews (44) Write a Review

Overall Rating 4.7

out of 5 stars

Installation Time:Afternoon

Installation Cost:$100-$250

  • Performance Gain 4.31579 4.3
  • Fit 4.921052 4.9

  • 5/5

    Installation Time: Afternoon

    December 24, 2011

    Works great JLT CAI!

    My car is an 07 manual GT, and I was very impressed with the gains I got from these. I have a JLT CAI that I've combined with a CDC shaker hood scoop, and these really work well with the new plates, especially in the mid to upper rpms. With the 93 octane race tune Bama wrote, my car will now break traction while cruising in second gear if I stomp it, so be careful when you're trying these out! Installation was not bad at all. The worst part was pulling those plastic tabs that hold the wiring harness to the fuel rail and intake manifold. However, this was only a minor annoyance. I do suggest using the instructions that are on the AM site rather than the ones that come with the plates. The AM instructions are much more detailed and tell you the proper way to reinstall and torque the intake manifold. Also, the carbon buildup on the intake manifold may cause it to stick to the engine when you're trying to remove it. Just apply a gentle and even upward lift and it will break free. Do the same when removing the old plates from the manifold. All in all, these are a good investment for anyone with a CAI and/or bigger throttle body because you're really not getting the most out of your intake mods without them. I can only imagine how well they would work with a Vortech s/c! These would probably work great with the FRHR cams too.


    Year: 2007 Submodel: GT

    Helpful (1) (0)

  • 5/5

    May 20, 2011

    Good upgrade

    Nice upgrade, very easy install. Took about 1 hour to install. I noticed it pulls harder in the midrange. No waiting for the butterflies to open up. Smoother pull. My car is auto.

    Jose rueds

    Year: 2006 Submodel: GT

    Helpful (6) (0)

  • 5/5

    January 03, 2011

    A Must-Have!

    This is an absolutely necessary step. The restriction is removed! You should see the stock butterfly valve assembly with actuator motor... GOODBYE! These really made a difference. Of course, I had Bama tunes send me a new tune and loaded it while my mechanic was putting these on. The results were pure rock and roll. These are as important as CAI, TB, headers, and exhaust no doubt. Free airflow is key! Highly Recommended.


    Helpful (10) (2)

  • 5/5

    April 05, 2010

    Very Happy!!

    After recieving my plates I coundn't wait to install them. It only took about an hour and the results were more then I had hoped for. These plates and American Muscle are number 1 to me!

    James Frakes

    Helpful (9) (2)

  • 4/5

    Installation Time: Less than 1 Hour

    February 25, 2012

    Noticable gain

    I keep seeing a bunch of post of "omg it really made my stang come to life!" to be honest with 4.10's and other bolt ons its hard to see that much of a difference. the install was easy peezy, the throttle response i will say is alot better. get this product if you're interested.


    Year: 2005 Submodel: GT Albuquerque, NM

    Helpful (5) (0)

  • 4/5

    Installation Time: Afternoon

    May 13, 2013


    The directions are straight forward. You can take off the fuel rail and injectors as one unit without disconnecting the main fuel line (so you don't need the special tool). The power gains are slight, but the real benefit is that power is instant... there's no more of that 1 second delay waiting for baffles to open up. Now I can just floor it and go.


    Year: 2006 Submodel: GT MN

    Helpful (4) (0)

  • 5/5

    Installation Time: Afternoon

    February 04, 2013

    Fast and easy install :)

    Took about 1 hour to install. Got to see the need for the oil separator while installing this... all that oil going back into the engine... does not look too great. Very easy install for the plates! :)


    Year: 2006 Submodel: GT

    Helpful (4) (0)

  • 5/5

    May 25, 2011

    Love it

    This the 3rd mod I have done to the car. At first I was worried about installing this myself but trust me it was so easy. There was nothing hard about this at all. I also had a Baka tune to go with this. From first to 5th I could deff. Tell the car pulled harder and all around breathed better. Again do not worry about doing this yourself


    Year: 2007 Submodel: GT

    Helpful (9) (4)

  • 5/5

    Installation Time: Afternoon

    January 18, 2012

    Pressing the gas never felt better

    This upgrade really made my pony jump. I have the custom tune, with a gms TB, a magnapack catback, CAI, and now these! 1st gear.. you lose traction very easily now. The higher RPMS, the acceleration is amazing. This is a must have if you're looking for the next step.


    Year: 2005 Submodel: GT New Jersey

    Helpful (3) (0)

  • 4/5

    Installation Time: Shop Install

    December 08, 2011

    Great Product

    I got these installed with the Under-drive pullies, Ford hot rod cams and a tune and what a difference!! I laid down 332hp and 322 tq. This car is a whole new beast and i can tell the car adapted to the plates with the amount of high end pull it gives, it just screams to 6500 RPM and i can tell the open valves have helped. Thanks American Muscle for all the parts and fast service.


    Year: 2007 Submodel: GT Everett, WA

    Helpful (2) (0)

  • 5/5

    August 08, 2010

    its great

    easy to install and made a great leap in performance

    bill brian parsons

    Helpful (5) (3)

  • 5/5

    Installation Time: Full Day

    January 19, 2013

    Easy install, decent gains, tune required!

    These are made out of solid billet aluminum and add an extra 20 grams over the standard cast pieces with the butterfly valves and linkages. They are designed to fit 2005-2008 Mustang GT with the 4.6L 3V V8 engine. 2009-2010 Mustang GT intakes have the valves built into the intake manifold and will require a different product (delete plugs). A new engine tune/calibration is required because the IMRC/CMCV has to be shut off, and a few other things need to be done to maximize the power gains with these plates. After doing extensive research on these plates, I have found that with a good tune the plates alone will net approximately 10 rwhp gains without any loss of low-end torque/power. There are a lot of discussions going on about the potential for losing low end power, but based on discussions with tuners that I know and reading dyno graphs, the power gains are only positive throughout the engine operating range. The CMCV/IMRC is apparently used only for emissions control, as the new 5.0L DOHC V8 used in the 2011-up Mustang GT does not use any type of IMRC/CMCV and instead has variable cam timing for intake and exhaust valves that most likely do all of the emissions reduction. The overall installation took about 3-4 hours, mainly because I took it very slowly and had numerous meal and bathroom breaks. My 07 Mustang GT also had about 12k miles, so the intake manifold gaskets (the green silicone/Viton gaskets attached to the valve plates) got really stuck to the cylinder heads and required some additional force to lift out. There was also a lot of dirt and grit to clean out of the engine due. The LH plate is for the driver’s side, and the RH plate is for the passenger side. I followed TacoBill’s installation guide, which has the best photographs of any online guide I have found. The fuel line does not have to be disconnected, and the air intake tube does not have to be removed either. The air intake tube at the throttle body has to be disconnected though. Also, the vacuum tube on top of the PCV tube simply requires the white tab to be fully depressed to disengage the lock (the tube above the one with green rotating lock tabs). After installing the plates and my new tune, I did not see any check engine lights or RPM flare up after a cold start. It started up like normal and idled very smoothly. I have not taken it on the road for a test because of the weather (winter in Michigan) but it did not exhibit any problems. Overall: 5 out of 5 stars, a great modification if you wish to stay naturally aspirated or utilize the stock intake manifold. I originally wanted to buy the Ford Racing intake manifold, but every dyno test of that intake showed significant decrease in power and torque below 5000 RPM with all of the gains well above 5000 RPM. Even with the 3 Stage CNC heads and Hot Rod cams, the Ford Racing intake manifold only showed gains at the 6000-7000 RPM range, and the stock intake manifold provided the largest area under the power and torque curves in all of the scenarios.


    Year: 2007 Submodel: GT Michigan, USA

    Helpful (5) (4)

  • 5/5

    Installation Time: Less than 1 Hour

    March 28, 2012

    Best modification yet!

    First thing you notice is it is a shame that these are hidden. They are a beautiful piece of machine work! Installation is straight forward but don't forget to disconnect the vacum line for the brake booster. No other surprises. I completely removed the actuator motor since my Bama tune deleted it. 5 pounds of dead weight gone! Throttle response is much quicker both on and off. Bottom it!


    Year: 2007 Submodel: GT Bellingham, WA

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    April 06, 2012

    Easy install nice feel

    The part quality is excellent. Install time was around 90 mins with only a few tools. The car had a feeling of accelerating easier and faster with less gas pedal. This were installed after my long tubes and mid pipe along with a bama tune. Totally worth it.


    Year: 2008 Submodel: Bullitt Richmond,tx

    Helpful (1) (1)

  • 3/5

    Installation Time: Afternoon

    June 25, 2013

    For Mod-Heavy Applications

    I recently installed Steeda's Charge Motion Control plates on my 2005. Fit and finish was perfect, definitely a well made, quality product. The top end does seem to have slightly more pull, however, there has seemed to be a noticeable loss of low end torque (mainly before 2750 rpm). I'm sure that with more mods the high end increase would make up for the low end loss (especially FI applications), but in my system I feel that it has made my mustang slower as a whole (FRPP intake, BAMA custom tune, straight pipes). I still have high regard for the product and recommend it, and as always AM had stellar service.


    Year: 2005 Submodel: GT Illinois, USA

    Helpful (0) (1)

  • 4/5

    Installation Time: Afternoon

    July 28, 2013

    Almost great

    Good product, installation instructions was complicated but still got it done .


    Year: 2005 Submodel: GT houston tx

    Helpful (0) (2)

  • 5/5

    Installation Time: Afternoon

    May 19, 2012

    Free air

    These are very high quality for the buck. Get rid of the motion control valves and get even more power. I installed myself with standard tools. It took me around 6 hours and I really took my time with it. The directions are not that great so make sure you know the car or have a shop manual handy to make sure you get everything detached before you pull the intake off. It's hard to say how much power this adds but it can't hurt. With long tubes, CAI, underdrives, under drive pulleys, 93 Bama tune, GT500 TB and got 347 RWHP on they dyno.


    Year: 2008 Submodel: GT

    Helpful (2) (3)

  • 5/5

    Installation Time: Less than 1 Hour

    January 27, 2012

    air flow

    Well these helped greatly and are a must with a turbo application. I only got 481 and 500 trq before these and after I got 687 rwhp and 760 tq. Now I know on a stock motor the gains aren't that big but on my turbo setup the stock control valves weren't opening correctly and not letting boost in. So best money spent for me. And they look way better than stock.


    Year: 2006 Submodel: GT virginia

    Helpful (2) (24)

  • 5/5

    August 01, 2016

    Steeda Billet Charge Motion Control Plates

    Absolutely love the plates. I really do feel a little bit more horsepower.. They are great to truly maximize the amount of air for your pony can take in!


    Year: 2005 Submodel: GT

    Helpful (0) (0)

  • 5/5

    Installation Time: Afternoon

    July 03, 2016

    Such a Great Addon

    These motion plates really do add a kick to your Mustang. Just comparing the old plates to the new ones already show the advantages of how much better the plates are. with the old ones, you can see the plates being controlled by actuator arms and butterfly plates like the throttle. With the new plates, it gets rid of the actuator arms and butterfly plates, and its lighter! Only thing is when you install it, youre gonna get 2 engine codes for left and right banks on your engine, so youre gonna need a retune for them. But overall, this is a great addon to your mustang and you will definitely see a performance gain with a retune and more air getting into the engine


    Year: 2005 Submodel: GT

    Helpful (0) (0)

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