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Magnaflow Direct-Fit HM Grade Catted H-Pipe (05-09 GT)

Item 402873
Market Price $470.71 You Save 12% ($54.15)
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$416.56 (each)

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    Features & Details

    • HM Grade Catted H-Pipe
    • Improves Exhaust Flow
    • Improved Torque and Horsepower
    • High-Quality Metallic Catalytic Converters Included
    • 2.50-Inch Mandrel-Bent Stainless Steel Construction
    • Direct-Fit Installation
    • Limited Lifetime Warranty
    • Designed for Stock Manifold or Shorty Headers
    • Fits All 2005-2009 Ford Mustang GT Models
    Aggressive Exhaust Sound. Your Mustang GT has an incredible stock exhaust sound. You can make the sound even more aggressive by installing the Magnaflow Direct-Fit HM Grade Catted H-Pipe. With this H-pipe, you will make a grand entrance wherever you go with your GT.

    Improved Exhaust Flow. Magnaflow incorporated a wide 2.50-inch tubing on this H-pipe. This goes a long way in enhancing exhaust flow while limiting backflow thus delivering an unprecedented performance boost. The H-pipe significantly boosts your Mustang’s rear torque and horsepower.

    Durable Construction. This high-grade H-Pipe is built using mandrel-bent stainless steel which is coated in a clear-coat finish. Therefore, it can withstand extremely high exhaust gas temperatures without leaking or losing its factory appearance.

    Clamp-On Installation. Mounting the H-pipe to your Mustang is a direct weld-on process which takes approximately 2 hours. Installation requires technical proficiency. Mounting clamps and installation instructions are provided to ease the process.

    Limited Lifetime Warranty. Magnaflow backs its Catted H-Pipes with a limited lifetime warranty against structural defects. Some Limitations may apply.

    Application. Magnaflow Direct-Fit HM Grade Catted H-Pipe fits all 2005-2009 GT Mustangs equipped with Stock Manifolds or Shorty Headers.

    Fitment: 2005 2006 2007 2008 2009 Details

    MPN# 24151

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) Clamp-On H-Pipe
    Installation Info
    Will it fit my Mustang?

      Customer Photos (7) Submit Your Photo

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        Questions & Answers (14)

        5 Top Rated Questions

        Will this pass emissions in Washington state?

        • Being it's catted, this h-pipe should be able to pass emissions. With that being said, it completely depends on the state and their emission laws as it does vary. We recommend contacting a shop or state ordinances to confirm if this part will pass emission.

        Helpful (1)

        Looking for numbers on how much it will improve the performance, I didn’t see any on my end.

        • Gains will vary based on environment, driving habits, additional vehicle modifications, etc.

        Helpful (0)

        Will this work if I have SLP loudmouth mufflers?

        • This will replace your factory mid-pipe and can be used with the SLP Loudmouth Mufflers as the mufflers are further back in the exhaust system.

        Helpful (0)

        Is this a flowing free cat or basically the same cell count as OEM cats??

        • The Magnaflow Direct-Fit HM Grade Catted H-Pipe will use catalytic converters that resemble the same flow rate as the factory equipped catalytic converters.

        Helpful (0)

        Will this work with the bbk shorty headers you have on your site.

        • This will work together yes.

        Helpful (0)
        Post Your Question
        9 More Questions
        After installation, will this cause my check engine light to come on? 0 answer
        I live in the state of Texas my car will pass the emissions 1 answer
        Will this setup work with bbk long tube headers? 1 answer
        Magnaflow web site comferm that part # 24151 fit 2010 gt , is it !! 1 answer
        Will I throw a CEL with this catted h pipe? 1 answer
        Will this meat California smog specs ? 1 answer
        Can u use this on a stock exhaust system? 1 answer
        Would a tune be required? or can it run with the stock tune. 1 answer
        Is this setup significantly louder over stock cats and stock H pipe? I have axleback Magnaflow Magnapaks on my 07. 1 answer

          Customer Reviews (9) Write a Review

          Overall Rating 4.7

          out of 5 stars

          Installation Time:Full Day

          Installation Cost:$100-$250

          • Loudness / Volume 4.333333 4.3
          • Exhaust Note 4.375 4.4
          • Fit & Finish 4.111111 4.1
          • Bang For Your Buck 4.666667 4.7

          • 5/5

            September 19, 2019

            Fits perfectly!

            This h pipe was easy to install and fits like a glove! I really can’t tell exactly what the difference in sound is compared to the stock pipe because I installed a Borla atak system at the same time but I can tell you it sounds sweet. The whole installation of the axelbacks and h pipe took about 7 hours only because I ran into a couple of issues. I broke a bolt off in the manifold, had a bad welding tip, and ran out of argon gas while welding. I would highly recommend this h pipe!


            Year: 2007 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Afternoon

            August 22, 2019


            I had these installed on my 2007 Mustang GT along with Flowmaster Outlaw mufflers. Before this combo, I had a regular Flowmaster mufflers on it, along with the stock catted H-pipe. With this new setup, the sound is AMAZING!! The mechanics took under 2 hours to install both sets and they said that the install went pretty good. So there were no problems with the fit or installation. It is worth repeating again: the sound is AMAZING.


            Year: 2007 Submodel: GT

            Helpful (2)

          • 5/5

            Installation Time: Shop Install

            July 04, 2019

            Catted H pipe

            Good fit, and function. Better flow equals more power, and a bit more rumble.


            Year: 2007 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            April 13, 2019

            Magnaflow Beast

            My GT already had a muffler delete system and sounded pretty boss. But the Magnaflow sounds great. Beastly growl.


            Year: 2007 Submodel: GT

            Helpful (2)

          • 3/5

            Installation Time: Afternoon

            April 04, 2019

            Could be better could be worse

            Sounds great with my muffler deletes no cel after 1000 miles, gained about 1.5 mpg semi aggressive driving highway and city. Giving 3 stars due to the pass side pipe not being bent correctly, install was easy just couldn’t get the pass side to seal properly on the header and get everything lined up right. Had to cut the pipe after the car and weld it back on at a better angle. But other then that I’m pleased with it.


            Year: 2005 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            March 27, 2019

            deep tone

            paired mine with flowmaster outlaws and it sounds amazing.


            Year: 2006 Submodel: GT

            Helpful (0)

          • 4/5

            Installation Time: Afternoon

            March 14, 2019

            Good but a few issues

            These pipes sound good and are much louder than the stock mid pipe but the hangars on the one i received were not angled correctly and contacted the transmission. also it seemed that they were slightly too long because now the tailpipes stick out further from the bumper. Minor things that can be fixed just be aware its going to need some massaging to get it right.


            Year: 2005 Submodel: GT

            Helpful (3)

          • 5/5

            Installation Time: Afternoon

            November 14, 2018

            Magnaflow with High flow cats for stock headers.

            My stock cats were starting to smell like eggs on my 09 Gt. So have to stay these were easy to put in other then the header nuts being so tight and extra hanger rods that my car doesn't have "there was plenty of clearance though". I have flow master outlaws and they sounded great already by themselfs but I wanted to have the sound like those 5.0s have. I ordered these in hopes that it would be louder and OH they are! And you need a tune for these if your wondering. But all in all these are nice quality and way lighter then stock I would recommend to anyone. Only problem I didn't like was when I received them they were very loose in the box and were banging around in shipment but they were not damaged. Thanks AM as always!


            Year: 2009 Submodel: GT

            Helpful (7)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            September 25, 2018

            Great Stock Replacement for catalytic converter

            Had been getting a O2 sensor check engine code so figured I needed to replace the catalytic converters and trust American Muscle products so got the Magnaflow Direct-Fit HM Grade Catted H-Pipe (05-09 GT) replacement. Was a great decision after installing with a little pipe adjustment (1 1/2 hour install) they fit great and no welding involved. The Mustang runs like brand new, better H.P,. smoother shift, better gas millage, and sounds better. If you want to get your old muscle car back I recommend this product! Replaced the O2 sensors while it was up on the rack just plug and play.


            Year: 2006 Submodel: GT

            Helpful (7)

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