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MAC 1-5/8 in. Chrome Shorty Headers (05-09 GT)

Market Price $423.70 You Save 34% ($142.48)
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  • Item 40038

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    Features & Details

    • Increases Horsepower and Torque
    • Shorty Header Design
    • Free Flowing Mandrel-Bent Tubing
    • Bright Chrome Finish
    • For Use with Manual and Automatic Transmissions
    • Fits 2005-2009 GT and Bullitt Mustangs
    More Horsepower And Torque. Replace those restrictive stock manifolds with a set of MAC Shorty Headers to improve your mustangs exhaust flow and increase your Pony's horsepower and torque.

    High Quality Construction. Constructed from 1-5/8" mandrel bent 16 Gauge Steel tubing so there are no kinks to rob you of power, these MAC Performance Headers feature 2-1/2" True Fit Collectors that eliminate the need for gaskets which are prone to leak and blow out. These shorty headers are then completed in a bright chrome finish for good looks and a durable long life.

    Application. Designed as a direct bolt on, these MAC Shorty Headers will bolt straight up in the stock location to the factory Mid-Pipe on both automatic and manual 2005 to 2009 4.6L V8 Mustangs, including the GT and Bullitt models, for improve exhaust flow and sound.

    Fitment: 2005 2006 2007 2008 2009 Details

    MPN# 31705

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) Driver side header
    • (1) Passenger side header
    Installation Info
    Tech Specs
    Header Specifications
    Header Type: Short Tube Finish : Chrome
    Type Mid Pipe Required: Standard Fitment: 2005-2009 GT and Bullitt
    Will it fit my Mustang?

      Customer Photos

        Questions & Answers (2)

        2 Top Rated Questions

        Is this smog legal in California?

        • Unfortunately these shorty headers are not legal for use in California.

        Helpful (0)

        POwer gain ? How much HP will these add? Is the sound nice?

        • Depending on additional modifications the power yield will vary, however, with supporting exhaust components you can expect up to 10hp throughout the power band. With other modifications, you can expect to see a larger increase in power.

        Helpful (0)
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          Customer Reviews (6) Write a Review

          Overall Rating 4

          out of 5 stars

          Installation Time:Weekend

          Installation Cost:$500-$1000

          • Performance Gain 4 4
          • Fit 4.166667 4.2

          • 4/5

            Installation Time: Afternoon

            September 05, 2017

            Great for the price

            I installed these with the engine out during a v6 to v8 swap. They fit well and cleared everything. The finish of the headers (chrome was good) leaves a little to be desired but for the price it's fine.


            Year: 2005 Submodel: Other

            Helpful (11)

          • 5/5

            Installation Time: Weekend

            January 06, 2015

            It's worth the effort

            Read and understand the review written by silverstang. Do not try to install this any differently than how he explains to install these headers. You must take the steering column out. Put it back the same as it came out. Lock your steering wheel first! Do yourself a favor and get a stud removal tool before you start. The 5 mm socket either brakes the stud loose or rounds over. Do not use 12 point socket for this use he socket or 6 point socket. If you don't know what that is you shouldn't be doing this. Ok the passengers side you must take the starter out and get the engine secured [I used a 2X4 and my floor jack] then remove the passengers side engine mount. Oh do yourself a favor get the exaust completely out of the way first before you do anything!!! I thought I could work around it and finally got it out of my way. I was a sore puppy after getting done. I thought I was in pretty good shape too. If your like me you won't let anyone else touch your baby. So be patient and your hard work blood and sweat will be worth doing this. I'm getting Cecilia yes that's my cars name. Ready for a supercharger.


            Year: 2009 Submodel: GT Savannah, GA, USA

            Helpful (10)

          • 4/5

            Installation Time: Weekend

            November 23, 2013

            MAC shorty headers

            Good fit and design. Most noticeable difference is when you get on it higher in the rpm, that's when you hear them and feel them. It's not a ridiculous difference in sound and performance but definitely noticeable and added more throatiness. The chrome does change different colors but I think it looks awesome. AM had these on clearance for cheap so they were worth picking up. I have these hooked up to a UPR catted x-pipe and MAC muffler axle back. Great sound. Thanks AM


            Year: 2007 Submodel: GT Atlanta, Ga

            Helpful (10)

          • 1/5

            Installation Time: Shop Install

            Installation Cost: $500-$1000

            October 13, 2012

            Exhaust leak

            I bought these and had a shop install. After 10 and a half hours, they are installed and now I have a exhaust leak where the heads bolt up. Cost was 860 bucks, so I am 1000 bucks in and not happy. I am sure there is power gain and etc. WIthout the leak. I am going to talk to the guy and try and find somehow to fix it without going another 1000 bucks in the hole. not happy at all. I love American Muscle and hate to down anything from them. But for the price of install and headers you could who with long tubes


            Year: 2006 Submodel: GT College Station Texas

            Helpful (16)

            • Response from AmericanMuscle

              I'd absolutely take this back to the shop as there definitely seems to be something fishy going on with that install. We haven't heard of any leaking problems to date with these shorty headers. If you take it back to the shop and you are still having issues, please don't hesitate to give us a call so we can help figure out what's happening!

              Lisa, Customer Care

          • 5/5

            Installation Time: Weekend

            July 27, 2012

            Great Deal

            The headers fit great. They were chrome in color and came with all necessary hardware. Although I didn't like the idea of going gasketless I had decided to reuse my stock metal gasket and torqued the downpipes to it's rated torque and everything was great. If you got the money, pay for the install. If you want to prove to yourself that you can do it then by all means. You have to disconnect the steering wheel shaft and move to the side on the driver side and remove the oil dipstick and also disconnect the O2 sensor harness then pretty much it comes right out from the bottom after taken out all of the studs with a 5mm socket. You must have patience with this because it can take awhile. On the passenger side, which to me is the hardest. You must also take out the battery box and take off the starter. While the car is raised on jack stands you must put a jack up to the motor and take off the motor mount bolts (1 on each side) and raise the engine about 2 inches. After that you have to take out all 4 bracket to engine bolts and then either move it to the side or take it completely off. I found out the stud for the motor mount bolt swivels so with a couple of good tugs I could take the bracket all the way off and take it through the bottom of the car. You have more room to work in with it all the way off then you can get to the bolt and studs. You have to do these things. There is no way around it. I tried to look for the easiest ways to install and this review sums it up. I did this install in my garage with my car on jack stands with a whole lot of patience, sweat, and tears but I got it done. Oh yea, I forgot, when you disconnect the steering wheel shaft you must mark the location where it is with permanent marker or white out and lock the steering wheel in place and take out the key before you disconnect the shaft or your airbag spring will be messed up and you will have to take it somewhere to get it reset. My Haynes book was my guide in helping me with this install. I have done home jobs that the dealership was going to charge over three thousand dollars and more for. I would not attempt any job without reading the chapter in my haynes book for the install first. I did this alone with no help. It would help you greatly to at least have a second person to help. I hope this helps.


            Year: 2008 Submodel: GT

            Helpful (22)

          • 5/5

            Installation Time: Afternoon

            January 27, 2012

            Great bang for the buck

            I got the headers and I install them myself, I work in a shop so it wasn't too bad. Great quality plus no discoloration like you get on other brands. The car has a deeper tone and you can feel the power gain. Mix it up with an x-pipe and some hi flow axle back mufflers and you wont regret it.


            Year: 2005 Submodel: GT Miami

            Helpful (16)