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Mishimoto Down Pipe - Catted (15-17 Ecoboost)

Market Price $620.99 You Save 17% ($103.49)
Our Price

$517.50

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  • Item 390291
  • MPN# MMDP-MUS4-15CAT

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Features, Video & Details

  • Mishimoto Catted Down Pipe
  • Increases of 65 RWHP and 108 RWTQ with a Tune
  • Aggressive Exhaust Note
  • Free Flowing 3" Diameter Mandrel-Bent Tubing
  • 304 Stainless Steel Construction
  • High Flow Catalytic Converter
  • Additional O2 Bung - Ideal for Adding a Wideband Sensor
  • Includes 3" to 2.25" Step Down Adapter
  • Computer Tune is Required for Operation
  • Intended For Off-Road, Track Use Only
  • Compatible with Factory or Aftermarket Cat-Back Systems
  • Fits 2015-2017 2.3L EcoBoost Mustangs

Review & Installation Video

Review & Install Video

Hey guys, Stephanie with AmericanMuscle.com here with this Mishimoto downpipe that's available for all 2015 and up EcoBoost Mustangs. The Mishimoto downpipe is going to be for the EcoBoost owners who are looking for a stainless steel downpipe to replace the restrictive factory downpipe. This is a catted downpipe that allows for a factory or factory-like catback setup. The whole point of an aftermarket downpipe is to relieve some of the restriction around the turbo, because from factory it's pretty constricting. Opening up some of the air flow from the turbo can give some nice performance improvements. Basically when it comes to the turbo, if you're looking for performance, you're pretty much going to want air flow as unrestricted as possible so the turbo can spool quickly. The faster the turbo can spool, the more gains that you'll see. Taking a closer look at this downpipe here, it's a full three inch 304 stainless steel mandrel bent pipe with an optional step down. To break that down some, stainless steel is always going to be nice for exhaust components. You won't have to worry about corrosion with the Mishimoto downpipe. The idea behind mandrel bending is to get smoother exhaust flow. Smoother exhaust flow means more power and better performance. The step down is optional, which is great. If you run the adaptor, it's going to reduce the three inch down to a two and a quarter inch which leaves the option of keeping a stock catback or running an aftermarket two and a quarter inch one. Or, you can pair the downpipe with a three inch catback now or even down the road some. That means you can pick up the downpipe for some performance gains without having to purchase a complete new catback while you're at it unless you want to. Then you have some room to grow and the ability to upgrade in stages. A three inch downpipe is definitely going to be larger than the factory downpipe, which means that you are upgrading here. You're going to notice a difference when you compare the factory downpipe to this one here. This particular downpipe has a high flow cat, but if you're looking to get around that cat, Mishimoto does offer a downpipe that comes noncatted which is going to cost a little less than the catted version here which is typical to see in all exhausts. If you pick up the uncatted version of this downpipe then it's going to be even less restrictive than the catted version. Like I said, this is a high flow cat which means that it is more free flowing than the factory cat is. Even though the main idea behind an aftermarket downpipe is to help give the turbo unhindered air flow, swapping out your factory downpipe is also going to give you more sound, too, especially if you're running the uncatted version. You'll hear a lot more turbo noise and get more of that turbo four cylinder sound. Also, be sure to keep in mind that a computer tune will be required to run either the catted or the off road version of this downpipe, so it is going to be necessary to tune for this downpipe. Even if you are going with the catted version of any downpipe, it's always recommended to run a tune, especially if you want to be able to realize the full power potential behind upgrading your downpipe. Another nice thing about this downpipe is that it actually has the 302 bungs. This gives you room for the two O2 sensors and then another spot for a wide band as well which is always going to be a good idea when you start playing around with custom tunes and additional boost. This is a two piece design that comes with a floating two bolt flange, a slip joint connector, and a V band flange. It doesn't get any nicer than a good old V band. If you take a look here, you'll see that Mishimoto designed the downpipe to put the flex pipe in more of a horizontal position instead of a vertical one like some other brands do. What I've noticed with the downpipe offerings across all brands, at least at this point in time, is that generally speaking the higher end players like Kooks and CPE share the same ideas Mishimoto does here, while the less expensive options like BBK have the flex pipe vertically positioned. This is just a little food for thought. Pair that with the knowledge of the two three and it's firing order. When we look at price, the catted Mishimoto downpipe is pretty much right in the middle of the pack. It costs between $500 and $550 which is less expensive than Kooks, Stainless Works and CPE, but a little bit higher price than BBK. The offroad version is about $100 less. There are more options as far as brands with offroad downpipes. Mishimoto is still right around the middle of the pack there, too. When it comes to the install, luckily this isn't a bad one. You're probably looking at a few hours to get everything done. I'm going to call it a one out of three wrenches on the scale. This is obviously going to be easier to do on a lift, but of course you can get the job done using a jack and stands if you don't have access to one. You won't need anything out of the ordinary, just a few sockets, wrenches and a short extension. You're going to be removing the front and rear O2s for the install and swapping them over to the new downpipe. I'd just unclip and leave them in the factory downpipe and switch them after you get the old pipe out. This way you won't be twisting wires and it'll make for a faster install. You're going to be reusing the gasket from the turbo outlet, so don't forget to make sure to grab the factory downpipe gasket before installing the new downpipe, since sometimes the gasket can stick to the turbo. The third bung comes plugged, so if you're going to use it just remove the plug and put in your wideband sensor. If you're not ready for this yet, then just make sure that the plug is tight before you install the pipe. It's going to be easier to install the pipe in sections starting with the first section with the O2 sensors. Then, move on to the second section and insert the adapter, if you're going to use it, and through your reband on. The only other thing I'd say is to line the new downpipe up first before tightening everything down, but that's about it. So, only a few bolts and about two hours time for the install. Overall, the Mishimoto downpipe is a three inch stainless steel downpipe that can work with either a three inch catback or it can step down to work with a two and a quarter inch catback. You have a choice between either catted or noncatted depending on what you're looking for. Not only is this going to increase performance, but it's also going to open up some sound on the EcoBoost as well. You can check this out more online for yourself and see what you think. I'm Stephanie, and for all things Mustang keep it right here at AmericanMuscle.com.

More Power And Performance. Release all the hidden horse power and torque your Turbocharged 2.3L EcoBoost Mustang has to offer with a Mishimoto 3" Performance Catted Down Pipe. Mishitmoto has seen dyno proven power gains of 65 horse power and 108 foot pounds of torque at the rear wheels with a custom tune.

More Aggressive Sound. A Mishimoto Down Pipe not only helps improve power and performance of your S550 EcoBoost Mustang, but it also adds a much more aggressive exhaust note when compared to the factory down pipe.

Stainless Steel Construction. Manufactured from high quality 3" diameter 304 stainless steel tubing for superior strength and corrosion resistance, this Mishimoto Down Pipe features smooth mandrel bends throughout the entire piping to improve exhaust flow for more power and better performance.

High Flow Cat. Mishimoto includes a high flowing catalytic converter that features a 200 cell spun metallic core that is specifically engineered for maximum flow and surface area, perfect for force inducted applications such as the turbocharged EcoBoost Mustang.

Three O2 Bungs Built-in. Mishimoto designed their Down Pipe with three O2 bungs to accommodate the two stock O2 sensors as well as to give you the ability to easily add a wideband sensor if so desired.

Required Upgrade. For proper operation and maximum power potential this Down Pipe will require reprogramming the vehicles computer. AmericanMuscle recommends a Bama custom tune with a Mustang Handheld Tuner to reprogram the vehicles computer (ECU) for proper operation.

3" to 2.25" Adaptor Included. This Mishimoto Down Pipe can be installed onto an aftermarket 3" catback as well as the factory or an aftermarket 2.25" catback exhaust with the use of the included 3" to 2.25" step-down adapter. This adapter allows you to upgrade your EcoBoost Mustang in stages saving you money.

Application. This Mishimoto Catted Down Pipe is designed to fit both automatic and manual 2015-2017 EcoBoost Mustang models equipped with the turbocharged 2.3L in-line 4-cylinder engine.

Technical Note: This Mishimoto product is intended for off road use, and is not legal for use in emission restrictive states.

Fitment: 2015 2016 2017 Details

What's in the Box
  • (1) 2-Piece Downpipe
  • (1) High-Flow Catalytic Converter
  • (1) 3.0" Slip Joint Clamp
  • (1) 3.0" V-Band Clamp
  • (1) 3.0" to 2.25" Exhaust Adapter
Installation Info
Tech Specs
Down Pipe Specifications
Piping Material: 304 Stainless Steel Piping Size: 3" (includes 2.25" step down adapter)
Catalytic Converter: "Yes" - Intended for off-road use only Type Cat-Back Required: Stock, 2.25" or 3" aftermarket 
Tune Required  Yes Fitment: 2015-2017 EcoBoost
Will it fit my Mustang?
  • EcoBoost - 16, 15, 17

People Who Bought This Item Also Bought

Most Helpful Reviews

5/5
Good sound

I like the sound which is not loud but deep and noticeable. To gain the maximum power of this part you need a tune. Without a tune, you won't gain much HP but still the sound is different

Helpful (1)

5/5
Mishimoto Catted Down Pipe AMAZING!!!!!!

Install took about 40 mins. Very easy if you have the right tools. I previously put the MBRP Race exhaust on and it had the bass but i wanted the aggressive sound with it. Started it up and wow right away ...

Read More
Helpful (1)

Overall Rating 4.4 out of 5 stars
Read All 12 Reviews

Customer Photos

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12 Questions / 6 Answers

Ask a Question

Why after I installed Mishimoto Down Pipe,go for 7 days the lights up engine warningg , smoke a lot .

EdisonH

  • We would recommend taking it to a professional shop or a ford dealership to diagnose the issue that the car may be experiencing, there should be no reason why that down pipe would cause the vehicle to smoke.

    AMjordan

Helpful (0)

Why after I installed Mishimoto Down Pipe, communal gas alarm system?

EdisonH

  • Would it be at all possible to rephrase the question, not sure what is meant by the "communal gas alarm system".

    AMjordan

Helpful (0)

Will this attach directly to the MBRP cat-back exhaust?

Thomas

  • This kit features the 3" to 2.25" step down adapter, so if the MBRP cat back features a 3" system (most of them do) then this will work with it. If you are looking at a particular MBRP cat-back, we would be more than happy to verify the fitment with this downpipe. Please feel free to reach out to us via email, chat or phone if you are looking at a specific cat-back by MBRP.

    AMJEFF

Helpful (0)

Will this catted downpipe be able to pair with the Borla Atak exhaust? If So, will it be able to pass through emission tests and is legal/Will not void warranty? I live in California

JakeA

  • The Mishimoto Down Pipe will pair with the Borla ATAK Exhaust. However, it is not CARB Legal and will not pass emissions in California. It may also void your warranty, but we recommend double checking with the dealership to be sure.

    VincentV

Helpful (0)

Hi, I purchased the Ford Performance Ecoboost Calibration Kit, GT 350 CAI, and Ford Performance by Borla exhaust. I have not had these parts installed yet. I would like to have the Mishimoto 3" downpipe installed at the same time. My understanding is that the Ford Performance calibration learns after it has been downloaded from the Internet. Will it be able to learn to optimize the performance potential of this downpipe as well?

Snowball

  • Hello! Yes this kit will optimize the modifications that you have installed on your vehicle, the downpipe is no different!

    Doug P

Helpful (0)

When it says that it requires a tune would that be a e tune on the dyno or just a regular flash tune

FernandoA

  • The down-pipe will require a custom tune and it can be either a dyno tune or an emailed tune file. Some tuners such as Cobb and SCT has tune archives for aftermarket parts such as this down-pipe, however, we would not be able to confirm that there is a tune in their archive bank for this specific item.

    AMJEFF

Helpful (0)

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Customer Reviews (12) Write a Review

Overall Rating 4.4

out of 5 stars

Installation Time:Afternoon

Installation Cost:$100-$250

  • Loudness / Volume 4.454545 4.5
  • Exhaust Note 4.727273 4.7
  • Fit & Finish 4.545455 4.5
  • Bang For Your Buck 4.363636 4.4



  • 3/5

    Installation Time: Afternoon

    July 03, 2017

    Excellent except for...

    Went with the Mishimoto downpipe because of a lot of positive experience with their other products. Fit and finish top notch with everything machine perfectly. Exhaust note took on a deep rasp - not in a bad way either. No real exhaust note changes below 2500 rpm; over that and you hear it! Nice. Here comes the rub. The mating point for the downpipe to the catbacks has a flanged end. You can either 1) run as Mishi pipe as designed and have your 3" pipe reduce down to the 2.25" joiner or 2) buy the Mishimoto exhaust adapter so you can run 3" all the way back for another $85. Mishi adapter "may" work with other catbacks but warnings it may not are plentiful. I'm not bashing Mishi but that one proprietary flange put me in a position to have to drop another hundred to get 3" exhaust. Sort of like buying a car and being told afterwards the windshield wasn't included. Mishi quality is excellent but if I had it to do over, I would have gone with the Corsa or the Kooks downpipe.

    DeanBarker

    Year: 2016 Submodel: EcoBoost

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    February 10, 2017

    Good sound

    I like the sound which is not loud but deep and noticeable. To gain the maximum power of this part you need a tune. Without a tune, you won't gain much HP but still the sound is different

    Talaat

    Year: 2015 Submodel: EcoBoost

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    September 30, 2016

    Mishimoto Catted Down Pipe AMAZING!!!!!!

    Install took about 40 mins. Very easy if you have the right tools. I previously put the MBRP Race exhaust on and it had the bass but i wanted the aggressive sound with it. Started it up and wow right away i noticed the volume change and girthy explosive sound.

    Greg

    Year: 2016 Submodel: Ecoboost

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: 0-$100

    September 19, 2016

    amazing results

    I researched this downpipe very thoroughly then decided to purchase it and have a muffler shop install it. Before this downpipe i had a jlt intake and unleashed tune on my 2016 ecoboost mustang. They woke up the car pretty good. After the downpipe installation and tunes from unleahed the car is a beast. It really pulls hard at bottom end and at highway speeds which it hits in a hurry, it opens up hard even at half throttle. This is a great product. It is almost as fast as my 2013 5.0 now.

    al

    Year: 2016 Submodel: Ecoboost

    Helpful (1)

  • 5/5

    September 05, 2016

    Power!!

    Instant notice power gains. Noticeable change in the loudness.

    OG

    Year: 2015 Submodel: Ecoboost

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    June 09, 2016

    A must for your mustang

    This product provides a dramatic increase in performance, plus gives your car some extra growl. It's not gonna fix the exhaust notes but is still a noticeable improvement. I very much recommend it.

    Timothy

    Year: 2016 Submodel: Ecoboost

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    June 08, 2016

    Mishimoto Downpipes - Ecoboost

    Tremendous performance! I am impressed with the combination of my Rousch Cold Air Intake, MBRP Street Catback Exhaust and Mishimoto Catted Downpipe!! Unbelievable sound and aggressive performance with the Bama X4 Tuner.

    Rookie

    Year: 2015 Submodel: Ecoboost

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    March 03, 2016

    More power

    Easy to install, you can tell the difference in power and sound, the car is much more aggressive and with Bama performance tune it's a blast, highly recommended!

    Stangcr

    Year: 2015 Submodel: Ecoboost

    Helpful (1)

  • 1/5

    Installation Time: Afternoon

    October 15, 2017

    Can’t pass emissions test.

    Before warned this down pipe plus Bama Performance will not pass emissions test.

    Dedede69

    Year: 2016 Submodel: EcoBoost

    Helpful (0)

  • 4/5

    Installation Time: Afternoon

    September 12, 2017

    Great Downpipe

    I had a bit of trouble fitting the pipe into the turbo but that was more my own fault since I did the install myself on jack stands but the other than that the install was straight forward, the pipe looked good with not damage and good welds. Once all the bolts and nuts were secured, I put my Unleashed tune into the car and wow did the car feel different. I noticed more power and torque and with all my other mods, I could hear the turbo whistle and exhaust being loud and mean. The fitment was good and after putting over 5K miles on it since the install, it was still working like it should. I recommend this downpipe as a good way to unleash more power from the EcoBoost

    IzzyBlackS550

    Year: 2015 Submodel: GT

    Helpful (0)

  • 5/5

    Installation Time: Afternoon

    July 24, 2017

    Sounds Awesome!

    I love the downpipe! The car sounds much deeper and paired with the MBRP race catback its loud and mean! An issue was some damage when I received the pipe and the lack of support from AM and Mishimoto. Had to get it repaired and then installed.

    BrandonH

    Year: 2016 Submodel: EcoBoost

    Helpful (0)

  • 5/5

    Installation Time: Afternoon

    March 01, 2017

    Excellent product.

    I purchased this for my ecoboost, with an SCT tune. Brought out a really nice note with muffler deletes, and left resonator in place. HP is considerably greater. Giving the GT's a run for the money. Keep right up with the GT stock. Install took approximately 2 hrs.

    Fig

    Year: 2016 Submodel: EcoBoost

    Helpful (0)

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