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Magnaflow Street Series Cat-Back Exhaust (05-09 GT, GT500)

Item 48018
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    Features, Video & Details

    • Classic Muscle Car Sound
    • Street Series Muffler - Straight-Through Design
    • Durable Stainless Steel Construction
    • 2.5" Mandrel-Bent Tubing
    • 4" Polished Stainless Steel Tips
    • Fits 2005-2009 GT, Bullitt and GT500 Mustangs

    Review & Installation Video

    Review & Install Video

    Hey, Justin with here, taking a quick look at Magnaflow’s Cat-Back exhaust system, fitting the 2005-2010 Mustang GT and GT 500. If you’re looking for a quality exhaust with great fit and finish and a tone that’s slightly more aggressive than stock, then this exhaust from Magnaflow is definitely worth checking out. You’ll first notice this two piece 2.5” mandrel bent stainless steel tubing and the chambered mufflers which are going to be most responsible for keeping the noise levels down. Finally, everything exits out these 4” polished tips. Something to keep in mind here, even though this exhaust is relatively tame with the stock headers and mid pipe, it really comes to life when you add an aftermarket set of long tubes or an off road X-Pipe, so if you’re planning on bolting some of those parts up down the road and you still want to maintain a reasonable exhaust note without too much rasp then keep the Magnaflow at the top of your list. When it comes time to get everything bolted up just leave yourself a couple of hours from start to finish using basic hand tools. Now let’s hear how Magnaflow’s Cat-Back sounds compared to our factory exhaust.

    Free Flowing Exhaust. This Magnaflow Street Cat-Back Exhaust System delivers the ultimate exhaust for the 2005-2009 GT, Bullitt and GT500 Mustangs. By reducing back pressure for a free flowing exhaust, more power and torque is produced where it belongs - at the rear wheels.

    Classic Muscle Car Sound. The Magnaflow Cat-Back Exhaust System includes a set of two Street Series Mufflers that feature a free-flowing, straight-through perforated stainless steel core, with stainless mesh wrap and acoustical fiber fill to deliver that smooth, deep muscle car tone.

    Quality Magnaflow Construction. Constructed from high quality 2.5" mandrel bent stainless steel tubing for long life and a perfect fit, this Magnaflow Street Cat-Back Exhaust System features (2) Street Series mufflers and (2) brightly polished 4" stainless steel tips for great Muscle Car styling.

    Application. Designed as a direct bolt on for the 2005 to 2009 GT, Bullitt and Shelby GT500 Mustangs, this Magnaflow Street Cat-Back will bolt straight up to the factory Mid Pipe without any modifications required for more power and a classic muscle car sound.

    Note: Coupon codes cannot be applied to this product.

    Technical Note: Americanmuscle recommends adding the 2005+ Mustang 304 Stainless Steel Exhaust Hanger Kit from the drop down option above, to provide more strength, stability and a cleaner installed appearance. If you have a 2007 Mustang you may need the kit for correct installation.

    Fitment: 2005 2006 2007 2008 2009 Details

    MPN# 15881

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (2) Flow Tubes
    • (2) Mufflers
    • (2) 2.5" Band Clamps
    Installation Info
    Tech Specs
    Cat-Back Exhaust Specifications
    Piping Material:Stainless Steel Tip Material :Polished Stainless Steel
    Piping Size:2.5"Tip Size:4"
    Muffler Type:Straight-throughFitment:2005-2009 GT, Bullitt, GT500
    Will it fit my Mustang?

      Customer Photos (6) Submit Your Photo

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        Questions & Answers (5)

        5 Top Rated Questions

        Are these louder then the Magnaflow Competition Cat-Back Exhaust - 2.5in. (05-09 GT, GT500)?

        • The competition may be slightly louder than the street. The street is going to have more of a muscle car sound while the competition has an aggressive sound. I suggest checking out some exhaust videos that will help give you a better idea of what each one sounds like.

        Helpful (1)

        Hello, I have a 2005 Mustang V6 and I'd like to install this kit along with a MAC H Pipe. Is it possible? What else do I need to complete the conversion? Thanks Giuliano

        • The Magnaflow Street Cat-Back GT Exhaust will fit with the MAC Cut & Clamp Pro Chamber V6 Mid Pipe for the 2005 V6. Additionally, the exhaust diameters on the end of the cat-back, and the end of the mid-pipe, which meet are both 2.5 inches, so it will fit like a glove.

        Helpful (1)

        What horse power is gained with magnaflow exhaust with cat backs- headers and cold air intake on a 2006 Mustang GT 4.6

        • Unfortunately we are unable to determine the exact numbers. We recommend checking with your tuner.

        Helpful (0)

        Since the new noise law came in effect in California, will this exhaust noise level pass in California?

        • At this time we do not have a decibel reading for this exhaust.

        Helpful (0)

        What kind of horsepower can I expect with this system?

        • Depending on the modifications this Magnaflow Street Cat-Back Exhaust can add up to 10hp in curve gains with a proper tune.

        Helpful (0)
        Post Your Question

          Customer Reviews (16) Write a Review

          Ratings Summary

          4.1 out of 5 overall rating from 16 customers

          Installation Time: Afternoon

          • August 30, 2018

            4 2005 GT - Jon Installation Time: Less than 1 Hour

            Nice low rumble

            I’d believe it was stock if I didn’t know. It has a deeper sound than stock and sounds great. No cheap rattle like some others I’ve seen. Seems like good quality however, it wasn’t well packaged. It comes in four pieces with two long pipes and two axle backs. One of my axle backs was bent where it slides over the long pipe. I was able to straighten it without issue.

            Helpful (3)
          • April 03, 2018

            5 2005 GT - SteveR Installation Time: Less than 1 Hour

            The only Pipes for my Mustangs!!

            This was a great purchase and well worth the expense. I love the throaty sound of the Magnaflow's on my 2005 Mustang GT. I installed them on my 2017 Mustang GT California Special (Catbacks with X-pipes from Magnaflow) as well. Totally happy with both of my Mustangs now.

            Helpful (5)
          • March 06, 2018

            5 2005 GT - JulianV

            Came on my used car

            I recently purchased a 2005 mustang GT that I noticed had magnaflow mufflers on it when I went to look at it at the dealer. I thought it was just replacement mufflers but I went to have a Pypes cut and clamp X pipe installed earlier today and the guy told me it is a cat-back exhaust system and I can tell from the pictures that this is my exhaust system. It appears to have been in there for several years, it sounds great, loud enough that my neighbors can all hear me but not ridiculous or annoying, there is no rasp or rattling sound like with cheaper exhausts, at around 1900 rpm you hear a harmonic note, and around 3000 rpm you hear another harmonic note, musical exhaust for sure. I get that muscle car slightly choppy idle and rumbles when it gets a good rev and is dropping revs, and a nice roar when i open the throttle up. Not sure how it compares to stock since I have never owned a mustang with stock exhaust.

            Helpful (5)
          • November 24, 2017

            5 2008 GT500 - Cdub

            Good deal

            Love em, sounds good, easy to install and can feel the added horsepower

            Helpful (5)
          • April 30, 2016

            3 2006 GT - Jbrown Installation Time: Afternoon


            I bought this system a while back; you will not get that 60's muscle car rumble with this exhaust alone, even with my CAI and tune it is still not up to par! I definitely will look into something way louder than this.

            Helpful (7)
          • January 06, 2014

            4 2007 GT - bigjohnny Installation Time: Afternoon


            Great fit and finish but lacks the rumble i desire. I had, prior to my 2007, a 2002 gt that was equipped with a cat back that had the same magnaflow mufflers, my 2002 gt was twice as loud as my 197. This package will give a you a slight louder tone over the stock exhaust. I Will be sticking with magnaflow quality and soon be buying magnaflow magnapacs.

            Helpful (6)
          • December 21, 2013

            5 2006 GT - Hawaiian06Mustang

            Great exhaust..

            I purchased my 06 Mustang 2 years ago and already had JBA shorty headers and this Magnflow cat-back exhaust. It had the factory cats on and the note was good, but rather quiet on the volume. I recently put in "rough idle" cams and Pypes off-road H-pipe. It's got a real deep rumble, the cams sound awesome, and at WOT, it roars! So, if you intend to keep stock cats on, then these Magnaflow are pretty quite, but w/ off-road H-Pipes, it's pretty load. Hope this review helps... Aloha!

            Helpful (7)
          • September 09, 2013

            2 2008 GT - PhilChose Installation Time: Less than 1 Hour


            My mechanic had certified I would love that sound, that he installs only that model on Mustangs, etc. I cannot understand how he was able to give such an opinion. I am definitely disappointed. My stock exhaust was louder. That product is in no way an upgrade. Nobody would change their exhaust to get a model that sounds like all but not what decided you to change your exhaust. I feel I wasted $1,000, including workmanship.

            Helpful (8)
          • April 19, 2013

            5 2007 GT - Luke17 Installation Time: Afternoon

            love it.

            Absolute love it. The polished stainless steel loks amazing. Fit was excellent. Super easy to install (did it in my driveway in two hours using one wrench and 2 sockets). The sound is a nice mean growl and an old school muscle car idle. I didnt want anything crazy loud but i wanted it to sound like muscle should. Magnaflow hit the nail on the head!! And americanmuscle had my questions answered and the kit at my door in less than 48 hours!! Thanks AM!!

            Helpful (7)
          • January 02, 2012

            4 2006 GT - blkbndt Installation Time: Afternoon

            good sound few minor probelems

            well i did this install along with the ford racing long tube headers and off road x- pipe and it sounds great, i think with the off road exaust and long tube headers gives it some extra volume that others complain they dont have. my only problem is the muffler on the passenger side does not sit right either in the clamps or on the hangers because it constantly rattles against the rear valence. and i have taken it off reinstalled it, even replaced the exaust hangers, eventually i just jammed a 2x4 under it, probelem solved. also the sound on these is just amazing when i start it up people are skeptical and confused cause it sounds stock if not quieter than stock, but once u rev it up above 3k rpm, it sounds like a monster. perfect sleeper exaust

            Helpful (8)
          • September 27, 2011

            4 2005 GT - GENTECH Installation Time: Shop Install

            Great sound

            after choosing between magnaflow and flowmaster, id have to say i am very happy with the performance of the magnaflow catback exhaust!! i heard the flowmaster catback on my buddys car..... big thumbs down!! Dont cheap out go with the magnaflow best bang for your buck!! thanks again american muscle on fast shipping and prompt service, industrys best!!

            Helpful (7)
          • January 30, 2011

            4 - Robert T.

            Sounds much better, Just not mean enough

            I really love the look and fixment of the catback set up. It was easy to install and sounds great. But I have to agree with Jason below. Was disappointed with the sound. I was hopeing for a meaner rumble, it just wasn't there. I'm still glad i picked the set up, just need to figure out how to get the rumble I was looking for.

            Helpful (9)
          • December 23, 2010

            2 - Jason

            Very Disappointed

            While these mufflers may look nice I was completely underwhelmed by the sound. I was hoping for that loud muscle car rumble and these do not deliver. They sound like stock if not quieter than stock. The fit and finish is superb don't get me wrong, it just if you want a loud rumble these are not for you.

            Helpful (8)
          • July 21, 2010

            5 2005 GT - MARTY KEENAN

            Big Improvement

            Had the Magnaflow Catback system installed on my 05 GT. What a big improvement it made on the sound over the stock exhaust. I recommend this as one of the first upgrades anyone does. Cant wait to get a set of Kook's long tuber headers to finish of the exhaust system.

            Helpful (6)
          • December 14, 2009

            4 2007 V6 - Justin

            Great System

            Just installed a magnaflow cut and clamp x pipe and these cat backs to my 07 v6 and i couldnt be happier. This exhaust isnt the most aggresive on a v6, but it gives you nice deep rumble with no raspy sound at high rpms. I highly recommened this system.

            Helpful (11)
          • June 16, 2009

            5 2006 V6 - Stone Abdullah

            SIC. Just SIC.

            Okay um, I just had this system installed on my \'06 4.0 sounds like it wants to EAT PEOPLE, sitting at a stop light feels like a water buffalo stampede is coming from behind you. Some one swore up and down I had a V8 under the hood. Not only that, I literally feel a difference in it\'s acceleration and overall performance. Ladies and gents, Magnaflow has got a SIC system.

            Helpful (8)

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