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Kooks Cat-Back Exhaust w/ Polished Tips (15-19 EcoBoost w/o Active Exhaust)

Market Price $1,545.99 You Save 12% ($179.27)
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$1,366.72 (kit)

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  • Item 390844

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    Features, Video & Details

    • 3 Inch Cat Back
    • Bright Polished Tips
    • Mandrel-Bent Stainless Steel
    • Made in the USA
    • For Use with Factory Down Pipe
    • Not Compatible with Active Exhaust
    • Fits 2015-2019 EcoBoost Mustangs

    Review & Installation Video

    Review & Install Video

    Hey guys, Stephanie with here with a review and install of the Kooks cat-back exhaust fitting all 2015 and up S550 EcoBoost Mustangs. We're going to be talking about a few different things with this exhaust today, but mainly we'll talk about the sound of the cat-back and the install. The install for this is easy. It's a one out of three wrenches on the difficulty meter since cat-backs for the S550 simply bolt right up, but I will get more into that later. The Kooks cat-back exhaust is going to be something that the S550 EcoBoost owner out there should consider if you're looking for a top of the line cat-back that's going to be loud and still work with the factory downpipe. Kooks is always producing exhaust products that are at the top of the exhaust world and this cat-back is no different. It gives the EcoBoost some volume but at the same time it isn't the loudest setup. Usually, the sound of a cat-back system is a combination of two parts of the cat-back, the midpipe and the mufflers. The midpipe section of this cat-back is a standard Y pipe for the EcoBoost and it's going to bolt right up to the factory downpipe. The mufflers, on the other hand, are Kooks oval race mufflers. In the sound clips you just heard you can tell that the car is both deeper sounding and louder as well. It does have some popping on decel, but it's not an overly raspy system that's just loud to be loud. It does have a controlled sound, but you're still looking at a pretty big change in sound. When it comes to exhaust for the EcoBoost, a lot of these exhausts are going to open up exhaust flow and therefore turbo noise. You'll be able to hear the turbo spool more during normal driving conditions since you're opening up that flow. That being said, finding exhaust for the EcoBoost can be tricky if you're looking for a particular sound. Even though this is a deep-sounding cat-back, it's not going to get you completely away from that turbo four-cylinder car sound. You have to keep in mind that that's what the EcoBoost is, a turbo four-cylinder car, so naturally it's always going to sound a little bit like that. As far as the sound rating, I'm going to call this one a three out of five on the loudness scale, one being a quiet upgrade and five being very loud. This is a two-and-a-half-inch cat-back in stainless steel and it's going to come with polished stainless steel tips. Other than your muffler assemblies and your midpipe, which we already talked about, you will also have your connection pipes, your over axle pipes, and some clamps for you as well. As far as price, I mentioned this earlier, but this is a top-of-the-line cat-back. It's full stainless steel and it's made by Kooks, so that means it's going to be on the more expensive side. You can expect to pay between $1300 and $1400 for this cat-back, which yes, is expensive, but it isn't the most expensive option out there. But if this is out of your price range, there are a ton of cat-back options for the S550 EcoBoost out there and a handful that cost less than this one, so you can always check out some of those. When it comes to the install, you're going to be looking at an easy one out of three wrenches on the scale when we look at difficulty. This is considered a direct bolt-on item, so you won't need to cut anything or modify anything to get it installed. All that you're really going to need is a socket set. And a lift would certainly make things easier, but the job can be done on jack stands as well. You're going to be removing the exhaust from the midpipe back. An extra set of hands can make things easier for you here. You'll be moving over your hangers to the new cat-back, so I'd recommend taking them off with the factory exhaust when you drop that. It'll only make the swap a little bit easier. The only other thing you'll reuse is the front clamps off of the resonator for the front of the new cat-back. The whole cat-back can be dropped as one big piece, which is why an extra set of hands can really help you here. When you go to install your new setup, it'll probably be easiest to start from the front and move back. So, install the Y pipe area first and then the intermediate pipes and the muffler assemblies. I'd leave everything loose until you have it all lined up and then tighten it down. The cat-back does come with new clamps, so you don't have to worry about picking those up. You can figure on spending about an hour or two from start to finish to get all of this done. Wrapping things up with the Kooks cat-back exhaust, this is a full two-and-a-half-inch stainless steel system that's going to create a much deeper tone for the EcoBoost. This is a loud cat-back but it isn't the loudest that I've heard. It is going to work with the factory downpipe, and it's going to come with everything that you need to complete the install. As always, you can check it out more online for yourself right here at

    Enhanced Sound. Don't settle for your EcoBoost's factory exhaust note. Gain a more demanding exhaust sound with the Kooks Cat-Back System. This EcoBoost Cat-Back is engineered to improve exhaust flow, enhancing both horse power and torque, to transform your EcoBoost in both function and sound.

    Quality Construction. This EcoBoost Exhaust is crafted from quality 2.5 inch stainless steel tubing for reliable strength under extreme heat, as well as reliable corrosion resistance for long lasting use. It comes equipped with bright polished tips that will easily complement your Mustang's exterior upgrades for a custom look.

    Direct Replacement. Designed as a direct fit, this exhaust system will mount to your EcoBoost's OE down pipe and uses factory hangers. No modification, drilling or cutting is required, making this bolt-on exhaust a simple upgrade

    Application. The Kooks EcoBoost Cat-Back Exhaust with Polished Tips is designed for installation on 2015 to 2019 EcoBoost Mustangs without the Active Valve Exhaust.

    Fitment: 2015 2016 2017 2018 2019 Details

    MPN# 11534200

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) Mid-pipe
    • (2) Connection Pipes
    • (2) Over-Axle Pipes
    • (2) Oval Race Mufflers
    • (2) Black Tips
    • (9) Clamps
    Installation Info
    Tech Specs
    Will it fit my Mustang?

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