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MAC Dual Exhaust Conversion Kit (99-04 V6)

Item 40048
AmericanMuscle no longer carries the MAC Dual Exhaust Conversion Kit (99-04 V6). Please check out Ford Mustang Cat-Back Exhaust for an updated selection.
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    Review & Installation Video

    Product Information

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


    • Adds the Look and Sound of a V8
    • Bolts Up to the Stock Factory Y Pipe
    • 2.5" Aluminized Steel Tubing
    • 3" Polished Stainless Steel Tips
    • "Flow Path" Chambered Mufflers
    • Fits 1999-2004 V6 Mustangs


    V8 Look And Sound. If you're looking to give your V6 Pony the dual exhaust look and aggressive sound of a V8, look no further than the MAC Dual Exhaust Conversion Kit from AmericanMuscle.
    Flow Path Mufflers. MAC Flow Path Chambered Mufflers feature a patented multi passage design, following Helmholtz's Theory of Tone, to produce a muffler that effectively flows exiting exhaust gases all while maintaining a desirable tone. With no packing that can burn out, Flow Path Mufflers will sound the same mile after mile, year after year.

    No Cutting or Welding Required. Unlike other aftermarket V6 dual exhaust kits that require cutting and welding the stock Mid Pipe, the MAC Performance Dual Exhaust Cat-Back system simply bolts right up to the stock Y-pipe for a no hassle installation. Just bolt on and go!

    High Quality Construction.
    Mandrel bent from durable 2.5" aluminized Steel tubing for strength and corrosion resistance, this MAC Performance Dual Cat-Back features two "Flow Path" chambered mufflers with massive 3" diameter polished stainless steel tips for classic muscle car sound and looks.

    The MAC Performance Dual Exhaust Cat-Back System is designed as a direct bolt-on to the existing factory Y-pipe on any 1999 to 2004 3.8L or 3.9L V6 Mustang for more power and a more aggressive sound.

    Technical Note. When buying a dual cat-back exhaust kit for your 1999-2004 V6 Mustang, you will need to select the "Exhaust Hanger Kit" from the drop down option menu above to properly install your new exhaust.

    Installation Note: AmericanMuscle recommends changing to a 1999-2004 GT rear fascia so the tips fit properly.

    Fitment: Details

    CA Residents: WARNING: Cancer and Reproductive Harm -


    Customer Reviews (100+)

    Write a Review

    Ratings Summary

    4.4 out of 5 overall rating from 100+ customers

    Installation Time: Full Day

    Installation Cost: $100-$250

    • July 27, 2019

      1 2000 V6 - Lissy9113 Installation Time: Shop Install

      Mac Exhaust Very Disappointed

      Purchased this exhaust conversion in May and just got around to installing it. I am extremely dissatisfied and disappointed in the quality. The package arrived missing pieces which AM replaced . The pipes did not fit from the muffler to the tailpipes. The tailpipe is touching my differential and I had to bring it to a exhaust shop to get the axle tailpipes on. The muffler hanger was welded backwards. I could go on...but AM did send the missing clamps so I don't fault them. But overall this was a horrible experience from the manufacturer and I definitely regret my purchase. After putting so much time and money in trying to make something for for my car which was supposed to fit out of the box.

      Helpful (2)
    • May 11, 2019

      5 1999 V6 - Espinoza Installation Time: Less than 1 Hour

      MAC Dual Exhaust

      This exhaust system is great and easy to install. I initially installed it complete using the mufflers but i decided i wanted a deeper note. By removing the mufflers the exhaust sounded amazing. I like it because its not too loud to the point were it becomes too much and when i accelerate i can hear the exhaust really good.

      Helpful (0)
    • April 27, 2019

      5 2000 V6 - DonH Installation Time: Afternoon

      switch over

      This exhaust switch went awesome! I do not have a lift, so was able to do it with car on jack stands. Great they way it is built and went together simple.

      Helpful (2)
    • January 24, 2019

      5 2001 V6 - DaveK Installation Time: Afternoon

      Mac V6 dual exhaust

      Super easy instal. Make sure you buy the hanger kit. Looks great .Sounds good. You cant beat the price.

      Helpful (4)
    • January 22, 2019

      5 2004 V6 - AnthonyG Installation Time: Shop Install Installation Cost: 0-$100

      MAC Dual Exhaust

      Fits perfectly, nice and loud, an excellent product, would recommend.

      Helpful (6)
    • December 17, 2018

      5 2003 V6 - RobertB Installation Time: Afternoon


      Once I got the hangers in place, the MAC Exhaust went together just like I knew what I doing. I still need to make some ajustments once it warms up, maybe come spring. I must say the sound is great.

      Helpful (4)
    • August 30, 2018

      5 2003 V6 - PrestonS Installation Time: Afternoon

      Perfect for the price

      After about a 2 and 1/2 hour install and a little bit of adjusting , it was a fairly easy job and sounds great for the price.

      Helpful (5)
    • August 25, 2018

      3 2003 V6 - IanH Installation Time: Afternoon

      Nice exhaust note

      This exhaust system sounds nice. It gave my V6 a nice throaty exhaust note and looks nice too. The only problem I think they should change is where the tips connect to the tubing its seems the tubing on the passenger side needs a slight bend and a bit longer tubing. It doesn't go straight like the driver side does. The passenger side has a slight angle to it, I had the fight it to make it straight but just had barely enough tubing to connect the tip. Other than that it was easy and it says to have someone help you but I was able to do it by myself no problem.

      Helpful (5)
    • August 01, 2018

      5 2001 V6 - JohnC

      MAC Dual Exhaust

      Very easy to install and fit very nice into the area under the car were they were suppose to

      Helpful (6)
    • July 04, 2018

      5 2002 V6 - MitchellA Installation Time: Afternoon

      Mac Dual Exhaust is great I love the product.

      I love the product, the Mac Dual Exhaust is great and l would recommend that people on a budget should get it. The note sounds awesome.

      Helpful (8)

    Questions & Answers (40 answers)

    5 Top Rated Questions

    Does this include hangers for the right side?

    • Judging from what I have read and understand about the MAC Conversion Kit the short answer is no. You will need to purchase a hangar kit to ensure proper installment. Pypes Hangar Kit seems to work fine and is not expensive, most exhaust shops will tell you when converting to a true dual exhaust, a hangar kit is essential if you want to actually have that dual exhaust.

    Helpful (5) Show 2 more answers

    I have a 2000 v6 3.8L mustang. How labor intensive is putting in a whole new exhast? With my mustang just having one exhast running straight back would everything line up ok going all the way back if i were to buy the MAC duel Echast Conversion Kit? i just want to make sure im buying the right one! Thanks!

    • Yes it would I literally just got it put on today and it took my shop person 2 hours to do it looks and sounds amazing the exhaust lines up even on both sides. You have to buy the pypes hanger kit from americanmuscle along with the mac kit to have all of the parts needed. I also recommend getting a cold air intake to make it sound to its full potential. How this helped!!!

    Helpful (3) Show 4 more answers

    Hi! Do i really need the gt fascia for the rear of the car to make this exhaust fit properly???

    • You would not need the GT rear bumper for this exhaust no. However with out the GT bumper, you will need to cut your factory bumper to allow the second tail pipe to clear the bumper.

    Helpful (2)

    Is this California CARB (smog) legal? Do they have an identification number tag if so?

    • This catback does not alter or move the location of the catalytic converter and will not affect emissions. The exhaust is legal for the use in California and states that have adopted their emission standards, however, it does not have a CARB OE number as it does not alter emissions.

    Helpful (2)

    Any HP/Torque Gains? even though it's not a complete dual exhaust, will it still have any HP/Torque gains?

    • Yes you will have some again but your better off adding a bama tuner kit or a better cold air intake and throttle body kit

    Helpful (2) Show 3 more answers
    10 More Questions
    If I'm running a flowmaster on my single exhaust v6 and got rid of cadilac converter would this installation be any trouble and my car sounds decent for a single exhaust so would this installation take away my flow master, I already have on and tune down my sound? Idk school me 1 answer
    How do i get a replacement exhuast tip ? I have this exhaust and my tip fell off while driving. Need to replace it 0 answer
    Does this come with both pipes? 1 answer
    Does this contain an area for O2 sensors or have cat converters so that the ECU won't trigger a check engine code? 1 answer
    I already added a SR performance in the wheel well cold air intake. Other than looks sound will this add any additional HP? 1 answer
    I noticed in the video that the pipes come really close to the rear tires. Will this kit fit if I have 275/40/R17s on the rear? 1 answer
    with this set up will i be able to still attach the catalytic converter from the stock pipes? 1 answer
    Is it possible to upgrade this to a true dual system by replacing the y pipe included in this kit with the Pypes 2.5 in. Stainless Steel Replacement Flow Tube Kit, and installing a Pypes off road x-pipe to my BBK Shorty Headers? Iā€™m not sure if it would not line up or fit correctly 1 answer
    Will this product be able to be put on a 96 mustang? 1 answer
    Can I put 'Pypes M-80 Center/Center Bullet Style Muffler - 2.5 in.' on this if I buy it? 1 answer

    Installation & What's in the Box

    Installation Info

    What's in the Box

    • (1) Y-Pipe
    • (2) Muffler Assemblies
    • (2) Tail pipes
    • (2) Exhaust Tips
    • (2) Clamps
    • (2) Hangers
    • (8) Threaded Studs
    • (8) Nuts

    Tech Specs

    Cat-Back Exhaust Specifications
    Piping Material: Aluminized Steel Tip Material : Polished Stainless Steel
    Piping Size: 2.5" Tip Size: 3"
    Muffler Type: Chambered Fitment: 1999-2004 V6 Mustangs

    Will It Fit My Mustang

    • V6 - 99, 00, 01, 02, 03, 04

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