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Flowmaster Scavenger Series Cut and Clamp Resonator Delete Y-Pipe (15-20 EcoBoost)

Item 389694
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      Review & Installation Video

      Stephanie with, here with the Flowmaster Scavenger Series Cut and Clamp Resonator Delete Y-Pipe, available for 2015 and up EcoBoost Mustangs.This Resonator Delete Y-pipe is going to be for the S550 EcoBoost owners out there that are looking to increase the sound level of their car quickly and without necessarily having to spring for an entire new exhaust system. Replacing the resonator with a Y-pipe can totally change the sound of the car, even with the stock axleback still installed. The resonator delete is firstly going to free up some power and, of course, volume since it will be replacing that restrictive factory resonator with a stainless steel Y-pipe that's more free flowing. And like I just mentioned, one of the cool things about this Y-pipe is that you can pair it with your stock mufflers for a change of exhaust note, or you can run it with an aftermarket axleback. But either way, you'll still maintain the use of your stock cats which will save you money and also keep you legal at the same time. A great side effect of replacing that resonator with the Y-pipe is a good deal more turbo noise, which I always think is a good thing, and you're going to notice a lot more turbo noise no matter what your axleback situation is. So on a scale of one to five, with five being the loudest, and keeping in mind that you're still going to have your stock cats, I'd rate this Y-pipe as a solid two with the factory axleback. It definitely opens up some sound, but it's not overbearing or crackly or too raspy with the factory axleback. But just to test things out a little, we also installed a Flowmaster axleback so you can hear what they sound like paired, and I'd rate that combo as a four on the loudness scale. At that point, everyone's going to hear you coming, and the pair have more of a raspier tone for sure, with a decent amount of crackling and lots of turbo noise and gurgle. As far as price goes with this Y-pipe resonator delete, it costs right in between $200 and $300, and as of right now, it's the only Y-pipe on the site that's currently available. And if you think about it, if you pair this with an aftermarket axleback, you've effectively created a cat-back for your EcoBoost, and you paid a lot less for it. You're welcome for that little side note. As for the install, you will be reusing your stock hardware, and like the name suggests, there will be some cutting involved but nothing too difficult. If you take your time, it's probably going to take about two hours to complete, and I'm going to call this two out of three wrenches on the difficulty meter, but mainly just because of the cutting that's involved. So overall this is a stainless steel resonator delete y pipe that can work with either the factory axleback or an aftermarket one. It also works with the factory cats, and it's going to free up some sound from the EcoBoost. As always, check it out more for yourself, and for all things Mustang, keep it right here at

      Product Information

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


      • Converts Factory "Resonator" Mid-Pipe to an "Y" Pipe
      • Improves Exhaust Flow and Sound
      • Muscle Car Rumble
      • 409 Stainless Steel Construction
      • Cut and Clamp Design
      • Reuses Stock Catalytic Converters - Smog Legal
      • Fits All 2015-2020 EcoBoost Mustangs


      Improves Exhaust Flow. Add even more horsepower and torque to the rear wheels of your Turbocharged S550 EcoBoost Mustang by replacing your restrictive factory Resonator Mid-pipe with a free flowing Flowmaster Scavenger Series Resonator Delete Y-Pipe. A Flowmaster Y-pipe will greatly improve your pony's exhaust flow for an increase in overall performance.

      Muscle Car Rumble. Flowmaster's free flowing Y-Pipe for the 2015-2020 EcoBoost Mustangs not only eliminates the factory resonator to help increase power, but it also adds a deep muscle car rumble to the sound of your exhaust with its classic "Y" crossover pipe design.

      Reuses Stock Cats. This Flowmaster Scavenger Series Y-pipe requires cutting and removing the factory Mid Pipe resonator and clamps in place reusing the stock clamps. Best of all it reuses the factory catalytic converter saving you money and keeping you legal at the same time.

      Stainless Steel Construction. Manufactured in the USA from durable 2.25" diameter free-flowing mandrel bent 16 gauge 409 stainless steel tubing for it's corrosion resistant properties, this Flowmaster Scavenger Series Y-Pipe will improve exhaust flow and last a lifetime.

      Application. The Flowmaster Scavenger Series Cut and Clamp Resonator Delete Y-Pipe is specifically designed for use on the 2015-2020 EcoBoost Mustangs equipped with the 2.3L Turbocharged engine.

      Fitment: 2015 2016 2017 2018 2019 2020 Details

      Flowmaster 81108

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (60)

      Write a Review

      Ratings Summary

      4.6 out of 5 overall rating from 60 customers

      Installation Time: Afternoon

      Installation Cost: 0-$100

      • May 20, 2020

        3 2015 EcoBoost - 15EcoPremOwner Installation Time: Afternoon

        Okay, not quite what I expected

        The item fits. I found the clamps to be very difficult to install and they ended up pinching the connector tube and causing a leak on one side. I will end up having to take it to a muffler shop to be welded. Somewhat disappointed. I took lots of time measuring and re-measuring, before cutting, but what took the most time and effort was getting the clamps installed. They required lots of tinkering with C-clamps, vice grips, and channel locks to even get them around the connector tube and the hardware on. Once I finally got the bolt through the hole, I could not get the nut on the bolt because there weren't enough threads exposed. I found out that using a socket and a C-clamp as a makeshift press worked to compress the clamp enough to get some threads exposed so I could get the washer and nut on the bolt. The instructions say to leave the clamps loose enough for adjustments. What a joke! Once they are on, they are one, no adjustment possible! I found the clamps to be of substandard quality, considering they are so hard to install and did not seal the connection from leaking. The factory clamp that is used in the front was easy to disconnect and re-connect with no leaks. Why doesn't Flowmaster provide quality hardware? As far as sound: I chose this pipe instead of a CAT BACK exhaust system because I thought the cat back would be too loud based on the videos on AM. I liked the sound of this resonator delete with stock exhaust and didn't want to have too much drone and pop from a 4-cyclinder...let's face it, this is an ECOBOOST and not a GT 350. It isn't going to sound like a muscle car, but it turned out a little quieter than it sounded to me in the videos and was a little bit of a letdown. As far as turbo noise, I do seem to hear more turbo noise...unless that is just the exhaust leak I am hearing and mistaking for turbo noise. Bang for the buck? Lots cheaper than a cat back system, but I'm not sure it does much. I only took it for a 10 minute test drive and am interested to see if I notice more during daily driving. Hopefully turbo lag will be mitigated and performance will increase.

        Helpful (0)
      • May 12, 2020

        5 2019 EcoBoost - NeilG Installation Time: Less than 1 Hour

        Easy install and great sound

        Had previously installed Outlaw Axle back, so no cutting was necessary when installing the Scavenger Y-Pipe. Really opened it up with minimal drone. Sounds great.

        Helpful (0)
      • April 22, 2020

        5 2019 EcoBoost - Rshaw Installation Time: Less than 1 Hour


        I honestly wasn't expecting that much of a difference but paired with a Flow-master Axle back that I had installed this month, what a difference. Its a truly amazing experience to drive home today. $90 to install.

        Helpful (3)
      • March 13, 2020

        5 2019 EcoBoost - Justmerlo Installation Time: Less than 1 Hour

        Yeah this would do the trick

        I had the flowmaster axel back exhaust so I added this Y Pipe and boy let me tell you it’s definitely a plus on the sound and just a slight increase of droning but well worth it ! Took me about an hour of install due to previous welding on the exhaust, had to cut that off but well worth it on this pipe

        Helpful (4)
      • March 09, 2020

        5 2016 EcoBoost - phillyb


        This is my first mod, and I'm super happy with the Y-pipe. Gives my Ecoboost some sound when Im driving. Everything else is stock on my car so far, but I do feel more torque and did notice some extra power. I'm using 93 fuel and have a KandN drop in filter. I'm very happy with this lil addition.

        Helpful (4)
      • March 09, 2020

        5 2017 EcoBoost - AlysseM Installation Time: Less than 1 Hour


        Perfect fit, sounds great, easy installation. Took about 2 hours tops

        Helpful (3)
      • December 22, 2019

        5 2016 EcoBoost - Alec Installation Time: Less than 1 Hour

        Cheap install and great Sound!

        Love the sound. I matched it with a flowmaster outlaw axel-back and the result was great.

        Helpful (3)
      • August 30, 2019

        5 2015 EcoBoost - JohnW Installation Time: Less than 1 Hour

        Great Value

        I have really enjoyed the new feel and sound of my Y pipe.

        Helpful (3)
      • March 14, 2019

        5 2007 GT - JoseA

        Very nice easy instal

        Love it great and easy instal wish it would have have alittle more noise but all in all has alittle more grumble down low

        Helpful (3)
      • March 13, 2019

        5 2017 EcoBoost - Mike Installation Time: Afternoon

        Works Perfectly

        I paired this with the factory exhaust sounds good and does not drone. Easy to install worked out good.

        Helpful (5)

      Questions & Answers (35 answers)

      5 Top Rated Questions

      I purchased the Flow Master Outlaw Axleback #525581 a few months back and like it. Now I want to know if this Flow Master Ypipe #389694 will mate directly to that Axleback system. I don't want to buy the Y pipe and then discover during the install that the Y pipe ends don't mate with the Flow Master outlaw axle back piping and I have to go search for a adaptor for each of the Y pipe ends to mate to the axleback piping. Thanks,

      • The Flowmaster Scavenger Series Cut and Clamp Resonator Delete Y-Pipe will pair up with your axle-back system with no problems! It will be a great addition and definitely help free up some horsepower.

      Helpful (3)

      Will this fit a 2019 ecoboost with active exhaust?

      • This will fit all 15-19 Mustang EcoBoost models.

      Helpful (2)

      Will the y-pipe work with the Roush Quad Tip Passive Axle-back Exhaust for the Ecoboost Mustang

      • The Flowmaster Scavenger Series Cut and Clamp Resonator Delete Y-Pipe should mount in the stock exhaust locations. So since the Roush Quad Tip Passive Axle-Back Exhaust would connect to the stock exhaust, it should work with this Y-pipe.

      Helpful (2)

      I want to add this to my Roush Power Pack level 2 I already have on my ecoboost. Would this work with the Roush power pack tune?

      • The level 2 Roush Power Pac's axleback exhaust will work with the Flowmaster Scavenger Y-Pipe. Since this unit will still utilize the stock catalytic converters, it will be compatible with the tune.

      Helpful (1)

      Hey guys will this pair with my Borla ATAK Cat-Back Exhaust I recently had installed? I’m looking for a little more noise. I have a 2016 Ecoboost.

      10 More Questions
      Hello. I have a '19 EcoBoost, and I'm thinking about pairing this with the stock exhaust. I love the depth of it. Now, to my question. Will you hear it when you take off, say going onto a freeway. Will you hear that really sound off while accelerating? 1 answer
      Would this Y-Pipe work with the factory active exhaust on a 2019? 1 answer
      Would this fit with the cv fab catless downpipe? If not which one could i pair with this pipe? 1 answer
      Does the Y-pipe require a tune? 0 answer
      Should I have it welded ? Or use clamps only ? I want to be able to remove Incase I need to take to dealer 1 answer
      Will this require a tune? 1 answer
      Will this y-pipe fit the AWE Touring Axelbacks? The pipe size on the AWE is 2.5. 1 answer
      Would it be possible to mate this item with a Borla ATAK axleback? 1 answer
      Hi, I just bought the Nxt Step Performance axle back for my ecoboost 18, will this fit this y pipe with no problems? Thanks 1 answer
      I'm going to be ordering the Flowmaster American Thunder axleback exhaust; will this mate directly to it, or will any adapters be needed? 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Y-Pipe

      Tech Specs

      Mid Pipe Specifications
      Style Mid Pipe: "Y"Type Headers Required:Shorty Headers or Stock Manifolds
      Piping Material:409 Stainless SteelPiping Size:2.25"
      Catalytic Converter:Reuses stock Catalytic ConvertersFitment:2015-2017 EcoBoost

      Will It Fit My Mustang

      • EcoBoost - 15, 16, 17, 18, 19, 20

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