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

Item 100517
AmericanMuscle no longer carries the MAC 1-5/8 in. Ceramic Unequal Length Shorty Headers for GT-40P Heads (79-93 5.0L). Please check out Ford Mustang Exhaust Headers for an updated selection.
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    Product Information

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


    • 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: Details

    CA Residents: WARNING: Cancer and Reproductive Harm -


    Customer Reviews (12)

    Write a Review

    Ratings Summary

    4.3 out of 5 overall rating from 12 customers

    Installation Time: Afternoon

    Installation Cost: $100-$250

    • July 18, 2018

      5 1993 GT - WesleyR Installation Time: Afternoon

      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

      Helpful (4)
    • May 21, 2018

      5 1993 Cobra R - Scott Installation Time: Less than 1 Hour

      MAC headers

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

      Helpful (5)
    • May 03, 2018

      5 1989 GT - JamesW Installation Time: Afternoon

      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.)

      Helpful (6)
    • February 15, 2018

      5 1987 GT - JeremyS Installation Time: Less than 1 Hour

      Perfect Fit!

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

      Helpful (4)
    • January 17, 2018

      4 1987 LX - SteveB Installation Time: Afternoon

      Gt40p mac headers

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

      Helpful (4)
    • November 11, 2017

      4 1989 LX - VictorS Installation Time: Afternoon

      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

      Helpful (4)
    • October 07, 2017

      4 1989 LX - Dylan Installation Time: Afternoon

      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.

      Helpful (5)
    • September 21, 2017

      1 1993 LX - WilliamF Installation Time: Shop Install Installation Cost: $100-$250

      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.

      Helpful (9)
    • August 15, 2017

      4 1993 GT - bobbyc

      93 Mustang mac headers

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

      Helpful (4)
    • June 09, 2016

      5 1992 GT - Flipper Installation Time: Afternoon

      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.

      Helpful (6)

    Questions & Answers (3 answers)

    3 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)
    Post Your Question

    Installation & What's in the Box

    Installation Info

    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

    Tech Specs

    Header Specifications
    Header Type:Short Tube Finish :Ceramic Coating
    Type Mid Pipe Required:StandardFitment: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