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MAC 1-5/8 in. Ceramic Unequal Length Shorty Headers for GT-40P Heads (79-93 5.0L)

Market Price $475.68 You Save 12% ($54.73)
Our Price

$420.95 (pair)

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  • Item 100517

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    Features & Details

    • Increases Horsepower and Torque
    • Shorty Unequal Length Header Design
    • Free Flowing 1-5/8" Mandrel-Bent Tubing
    • 16 Gauge Steel Construction
    • Polished Ceramic Finish
    • CARB EO Number: D-241-4
    • Fits 1979-1993 5.0L V8 Mustangs with "GT-40P" Heads
    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.

    Unequal Length Design. These MAC Performance Headers feature a shorty, unequal length design that in addition to making more power also cleans up your engine bay for a show-winning look.

    Ceramic Coating. These Headers are completed in MAC's Polished Ceramic Coating that not only looks great, but reduce under hood temperatures to help increase horsepower and extend the life of the headers. Ceramic Coated headers will long out last both chrome plated and polished headers.

    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 headers are then completed in a polished ceramic finish for good looks and a durable long life.

    CARB Certified. Best of all these MAC Mustang Headers are 50-state smog legal under Carb EO# D-241-4.

    Application. These MAC Shorty Unequal Length Headers are designed to fit the 1986-1993 5.0L V8 Mustangs with production and new angled spark plug 5.0L GT-40 “P” cylinder heads. Will also fit 1979 to 1985 V8 Mustang and other Fox chassis vehicles with modifications.

    Fitment: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 Details

    MPN# 50158

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) Driver side header
    • (1) Passenger side header
    • (2) Gaskets
    • (16) Header Bolts
    • (4) Threaded Bolts and Nuts
    • Bracket and Hardware
    Installation Info
    Tech Specs
    Header Specifications
    Header Type: Short Tube Finish : Ceramic Coating
    Type Mid Pipe Required: Standard Fitment: 1979-1993 5.0 V8 Mustangs with GT-40P Heads
    Will it fit my Mustang?
    • Cobra - 93
    • Cobra R - 93
    • GT - 87, 88, 89, 90, 91, 92, 93
    • LX - 87, 88, 89, 90, 91, 92, 93
    • Other - 79, 80, 81, 82, 83, 84, 85, 86

    Fits 5.0L V8's Only. 1979 to 1985 V8 Mustang will require modifications for installation

      Customer Photos (5) Submit Your Photo

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        Questions & Answers (4)

        4 Top Rated Questions

        what spark plug wires are recommended to use with these headers?

        • Those headers are compatible with any of the spark plug wires we have on the site, no specific one needs to be used with those headers.

        Helpful (2)

        How are these different from those listed as being for 94-95 model year 5.0L? My application is a '98 Explorer engine with GT40p heads in a 79 F-100.

        • We would be unable to confirm fitment for your vehicle with this sort of custom build. These headers are designed to work with 79-93 5.0 Mustangs.

        Helpful (1)

        What is the recommend mid pipe for the GT40p headers?

        • The MAC 1-5/8 in. Ceramic Unequal Length Shorty Headers for GT-40P Heads can be used with any full length mid pipe, or the OEM mid pipe. This will not work with shorty mid pipes. Final selection of your mid pipe will come down to personal preference on H vs X pipe, catted vs off road, brand and materials.

        Helpful (1)

        How much more horse power do I expect to gain with these header than my stock ones.

        Post Your Question

          Customer Reviews (12) Write a Review

          Overall Rating 4.3

          out of 5 stars

          Installation Time:Afternoon

          Installation Cost:$100-$250

          • Performance Gain 4.583333 4.6
          • Fit 4.833333 4.8

          • 5/5

            Installation Time: Afternoon

            July 18, 2018

            Great buy

            These headers is what my 93 fox with the gt40p heads needed in such a bad way. These things came in the mail within 2days of my purchase, just bolted them on last weekend and went on purrrrrfectly so much more clearance for the plugs and wires just all around great buy you can't go wrong with these. Spend the money and clean your engine bay up its WORTH IT


            Year: 1993 Submodel: GT

            Helpful (4)

          • 5/5

            Installation Time: Less than 1 Hour

            May 21, 2018

            MAC headers

            They fit the Ford p-heads perfectly. I used them on a 1992 F-150 4x4. Fit very well!


            Year: 1993 Submodel: Cobra R

            Helpful (5)

          • 5/5

            Installation Time: Afternoon

            May 03, 2018

            The only solution for GT40P Heads

            I haven't actually installed them on the car yet- just had to hurry up and buy them before they wind up being discontinued like the Ford Racing ones (I am a professional mechanic and a Ford/Fox specialist and have installed plenty of standard headers and foresee no extra work or fitment issues). I did test fit them on the heads on the workbench and they definitely have plenty of clearance around the plugs, unlike the myths about stock headers or other companies' standard headers (I've test fit stock headers and standard BBKs and they don't clear all the plugs.) Worth the money to keep from burning up plug wires, using/making special sockets to change plugs, etc. (Shorter plugs don't help either.)


            Year: 1989 Submodel: GT

            Helpful (5)

          • 5/5

            Installation Time: Less than 1 Hour

            February 15, 2018

            Perfect Fit!

            Great fit easy to install and really brings the engine bay together!


            Year: 1987 Submodel: GT

            Helpful (4)

          • 4/5

            Installation Time: Afternoon

            January 17, 2018

            Gt40p mac headers

            Headers fit ok , bolts they sent are cheap and too short


            Year: 1987 Submodel: LX

            Helpful (4)

          • 4/5

            Installation Time: Afternoon

            November 11, 2017

            Almost perfect

            American Muscle has incredible service and feast shipping. I would have given these five stars but the bolts they come with are already starting to rust and the header flange was a bit to big for my pipe. Otherwise they for perfect on my gt40p heads with ample boot clearance


            Year: 1989 Submodel: LX

            Helpful (4)

          • 4/5

            Installation Time: Afternoon

            October 07, 2017

            Cheaper than replacing plug wires constantly

            They bolted right up, no issues and no more burnt plug wires on my GT40P heads, the mating surface wasn’t the best but I installed them anyway and don’t have any leaks. They cleared my driver side steering easily. They look phenomenal, and cleaned up my engine bay well. I love that it comes with gaskets and new bolts. I would recommend these to anyone who’s running GT40p heads.


            Year: 1989 Submodel: LX

            Helpful (5)

          • 1/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            September 21, 2017

            TOTAL HEADACHE.................DON'T FIT

            These headers DO NOT fit GT40P heads. Plain and simple. don't waste your money only to get SO frustrated with these things that you want to destroy them with a sledge hammer. There is no way you can get plug wires on these things and you have to install the plugs FIRST to get the headers on. They might fit GT40 heads, but, NOT the P heads.


            Year: 1993 Submodel: LX

            Helpful (7)

          • 4/5

            August 15, 2017

            93 Mustang mac headers

            Fits perfect on my 93 foxbody Mustang gt , nice look under the hood very happy with these headers.


            Year: 1993 Submodel: GT

            Helpful (4)

          • 5/5

            Installation Time: Afternoon

            June 09, 2016

            GT 40P headers

            The Headers have a nice finish and seem to be welded and manufactured Well.The only thing one Header bolt was missing, looked like package may have been opened before.


            Year: 1992 Submodel: GT

            Helpful (6)

          • 5/5

            Installation Time: Afternoon

            December 10, 2015

            very satisfied customer

            I purchased the gt40p swap headers which fit great and gave me more performance and also looks a lot better than the stock headers underneath the hood for the money you can't go wrong excellent item would recommend for anybody with gt40p heads easy to install


            Year: 1994 Submodel: GT Ruther glen va

            Helpful (6)

          • 5/5

            Installation Time: Afternoon

            January 24, 2014

            My Unequal Length Shorty Headers

            My new headers were easy to installed. They look great on the engine. Plenty of space around them. And they sound great with my dumps.


            Year: 1991 Submodel: GT Fort Lauderdale, FL, USA

            Helpful (6)