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Borla Off-Road Downpipe (15-20 EcoBoost)

Item 389217
AmericanMuscle no longer carries the Borla Off-Road Downpipe (15-20 EcoBoost). Please check out 2015-2020 Mustang Downpipes for an updated selection.
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    Video Review & Installation

    Stephanie with, here with this Borla off-road downpipe that's available for all 2015 and up EcoBoost Mustangs. Like most factory exhaust pieces, the factory downpipe on the EcoBoost Mustang is pretty restrictive. So this downpipe is going to be for the owners who are looking for less restriction, which ultimately leads to some improvements in performance, because it helps the airflow of the turbo, where you pretty much want things as unrestricted as possible. So you can spool the turbo more quickly, which is where your gains will come from.Some of the main features of this particular downpipe are that it's a full stainless steel three-inch pipe, which is a bigger diameter than the stock pipe. And it's also Mandrel-bent, which may sound trivial to some, but it's important for smoother airflow. Another thing is this downpipe is uncatted, so there's an additional reason as to why this is less restrictive and more free-flowing than the factory downpipe.One of the great things about this downpipe is that it gives you an option when it comes to the rest of your exhaust. Borla includes an adapter for this downpipe, so you can still use your stock exhaust if you want, which I think is nice because you can still get the benefits of an aftermarket downpipe but you don't have to worry about springing for other exhaust system components while you're at it.Or your other option here is to go with a three-inch cat-back from Borla down the road if you want. And Borla is one of the only companies that give you this choice right now of sticking with your stock exhaust or going with an aftermarket cat-back.So even though the main idea behind an aftermarket downpipe is to help give the turbo unhindered airflow, swapping out your factory downpipe is also going to give you more sound, too. And since this particular downpipe is an off-road or uncatted downpipe, you can expect an even louder result.And speaking of this being an off-road option, keep in mind that it's probably best to have a hand-held tuner or have a reprogram after the install since you are removing the cat here. The Borla downpipe is a touch more expensive than other options that are on the site right now, costing just under $500. But it's one of the only full three-inch options out there, meaning it's got a three-inch diameter from start to finish, and it gives you that adapter if you need it.Another thing to point out here, the less expensive options on the site have the flux pipe position in a different location than the more expensive options do. They have it more in line with the pipe, while options like the Borla here have the flex pipe sitting more horizontal. If you think about it, the inline 2.3 that the EcoBoost has is going to be moving left to right, so I think this is a better placement for that flex pipe.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, and you won't need anything out of the ordinary, just a few sockets and some wrenches, and a jack and some stands so you can get under the car. Overall, I'm going to call this a one out of three wrenches on the scale.So wrapping things up here, this is an off-road full three-inch stainless downpipe that comes with an adapter that you can use or not use, depending on your cat-back situation. And not only is this going to increase performance, but it's also going to open up some sound on the EcoBoost as well. So I'd be sure to check this out more for yourself online.I'm Stephanie, and for all things Mustang, keep it right here at

    Product Information

    Features, Description, Q&A, Specs & Installation


    • Borla's Off-Road Performance Down Pipe
    • Increases Rear Wheel Horsepower and Torque
    • 304 Stainless Steel Construction
    • Free Flowing 3" Mandrel-Bent Tubing
    • More Aggressive Sound Compared to Stock
    • Includes Adapter for Use with Stock Factory Exhaust Systems
    • Is NOT CARB Certified
    • Fits All 2015-2020 EcoBoost Mustangs


    More Power and Performance. Add even more horsepower and torque to the rear wheels of your turbocharged Mustang by installing a Borla 3" Off-Road Down Pipe. This Borla Off-Road Down Pipe is larger than stock and eliminates the power robbing stock catalytic converter to help release all the hidden power and performance your S550 EcoBoost Mustang has to offer.

    More Aggressive Sound. Borla's Performance Down Pipe not only helps increase power and performance, but it also adds a much more aggressive exhaust note to your S550 EcoBoost Mustang, when compared to the stock down pipe.

    Stainless Steel Construction. Manufactured from high quality T-304 stainless steel for superior strength and corrosion resistance, this Borla Down Pipe features ultra smooth mandrel bent 3" diameter tubing to improve exhaust flow for more power.

    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.

    Application. The Borla 3" Performance Off-Road Down Pipe is designed to fit all 2015-2020 EcoBoost Mustangs. This Borla 3" Down Pipe can be install with a matching Borla Cat-Back or the factory 2.25" exhaust with the use of the included step-down adapters.

    Technical notes. Not legal for use on pollution controlled motor vehicles; intended for off road use only.

    Fitment: Details

    CA Residents: WARNING: Cancer and Reproductive Harm -

    Installation & What's in the Box

    Installation Info

    What's in the Box

    • (1) Off-Road Down Pipe

    Tech Specs

    Down Pipe Specifications
    Piping Material:Stainless SteelPiping Size:3" (includes step down adapter)
    Catalytic Converter:"No" - For off-road use onlyType Cat-Back Required:3" or 2.25"
    -Fitment:2015-2017 EcoBoost

    Questions & Answers

    10 More Questions

    Will It Fit My Mustang

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

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