Review & Install Video
Hey everybody, I'm Justin with AmericanMuscle.com and this is my detailed review of the Kooks Catted Long Tube Headers available for your 2015 and up Mustang GT. Now when checking out long tube headers for your S550 GT, you're going to find a few different options here at AM. All of them quality and all of them landing somewhere between the one to $2,000 mark with the Kooks Catted options coming in right in the middle of that. Now let's face it guys, long tube headers aren't exactly cheap. They're a solid investment, they're difficult to install, but they are going to be worth it. In fact, with the Kooks headers, expect gains of 20 to 25 wheel horsepower depending on your setup and depending on your tune in addition to the awesome change to your exhaust tone.
So with all that said guys, let's talk about why you might want to consider a set of long tubes from Kooks for your new GT. Well, honestly, it's simple. This is what Kooks is known for. This is their bread and butter, top quality materials here guys, 304 grade stainless steel throughout, perfect welds all made in the U.S.A. This is what you are looking for when making a big investment in a set of long tube headers. These are a catted version, so again, you are going to get the high flow cats here. It is going to add a little bit more to the final cost.
Kooks does of course offer an off-road version of the same headers. It's going to help keep the cost down a little bit more and you are going to be seeing some slightly bigger gains with that option. Now, this is the one and seven eighths inch version here from Kooks and I think you guys will find this is going to be the most commonly offered size for your Coyote-powered S550 GT.
I should point out though that Kooks does offer a slightly smaller runner and a one and three quarter inch version, and you can debate the difference in sizes until you're blue in the face, but here's the deal in the nutshell, guys. That smaller runner is going to be better and more traditionally suited for a naturally aspirated application bolt-on car, things like that, whereas the one and seven eighths inch version I have here will be just fine for NA stuff, but will really shine once you go boosted or once you go for big power.
So, basically if you want a header you can grow into, the one and seven eighths is generally the recommended choice. But again guys, don't take my word for it. Feel free to do some research on your own or always reach out to a Mustang expert if you should need a little bit more help.
The Kooks headers do feature a rather large three inch merge style collector, as you can see here, and this is equipped with Kooks patented scavenger spike system. So I know you can't see it now, but basically, if I were to cut right here, lop off this merge style collector, you're going to find a long spike protruding separating all the primaries. And what Kooks claims is that's going to actually improve exhaust scavenging and increase the exhaust flow in the process.
Now one thing that I do really enjoy about the Kooks long tubes, guys, is that all the primaries or all the tubing are essentially one piece, from the flange all the way down to the collector. And what that's going to do is eliminate extra welds, which can sometimes be a target area for cracks or weak spots. So what you'll find with some lesser quality headers, basically they'll use a number of smaller pieces welded together to make these bends. And again, they can lead to cracking if the welds are done poorly. But again, Kooks keeping them one piece here. It's going to make for a much cleaner product overall, and it's going to eliminate any of those weak spots that might crack down the road.
The Kooks long tube system is a factory linked system. And what I mean by that is, with everything in place here, it will bolt up to your factory cat-back or even your aftermarket catback without issue. As for the install, well, I'm not going to sugarcoat this one guys, it's not exactly fun. In fact, I don't hand out many three out of three wrench installs here at AmericanMuscle, but believe me when I tell you, long tubes for your Coyote will get a three out of three wrench install job from me 100% of the time.
Now, we call it a full day here on the site guys, and I believe that to be accurate. You can do this one on jack stands, but I highly recommend you don't. Obviously, a lift will be your best friend here. If this all sounds a little too intimidating, of course don't be afraid to leave this one in the hands of your local shop. You can thank me later.
All right guys, to wrap things up here with the Kooks long tubes, well what can I say? These are definitely a premium option when you're shopping for long tubes for your Coyote-powered GT. The quality is great, the craftsmanship is unmatched and they're going to fit like a glove. And again, I would go with the one and seven eighths over the one and three quarters. I know we talked about it a little earlier, but this is going to be the header you can grow into. It's going to work just fine if you're NA, but then if and when you go boosted, this is going to be the ticket for you as well. So be sure to check out a set of Kooks long tubes for your Coyote-powered GT right here at AmericanMuscle.com.