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Borla 1-3/4 in. XR-1 Long Tube Headers (11-14 GT; 12-13 BOSS 302)

Item 29022
AmericanMuscle no longer carries the Borla 1-3/4 in. XR-1 Long Tube Headers (11-14 GT; 12-13 BOSS 302). Please check out 2015-2021 Mustang Headers for an updated selection.
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    Video Review & Installation

    So the Borla 1-3/4 inch Long Tube Headers will be for the S197 GT or BOSS 302 owners out there looking to go with a high-quality long tube to use in conjunction with a Borla cat-back exhaust system or a corresponding Borla X-pipe. Now these catless or off-road long tubes will fall right around a thousand-dollar price point, while that knuckle-busting install will get a full three outta three wrenches on the difficulty meter from me, with a little bit more detail to come later in the video. So when most people hear the name Borla, you probably think cat-back exhaust system, axlebacks, things like that. The headers are another one of the company's specialties and it makes sense because you're still in the exhaust realm. And just like the company's popular exhaust systems, the headers are extremely high-quality, both in materials and craftsmanship, along with that fitment as well, and that's something a lot of our customers have pointed out in that customer review section. But why go with a set of long tube headers in the first place? Well, simple, right, to get more power and more sound out of your naturally aspirated or blown Coyote engine. Now the final power numbers will depend on a few different factors such as your tune, your supporting mods, the dyno conditions, things like that. However, I would say that anywhere from 15 to 20-wheel at least to the tire would be a safe guess, along with a quality tune, maybe even a little bit more for those bigger supporting mods like forced induction. And along with the increased power, another big plus when adding a set of long tubes like the XR-1s from Borla here, is the noticeable increase in volume and growl to your exhaust system, whether it be a Borla Touring, the S-Type, or ATAK. And that does lead me to my next very important point. In order to run these long tubes without modification, you're gonna need to run either a complete Borla cat-back, which does include an X-pipe, or just simply grab the X-pipe by itself, which is Borla part number 60513. Now, if you do grab that X-pipe without the corresponding Borla cat-back exhaust system, there will no doubt be modification needed to get everything hooked up correctly. On the other hand, if you just simply buy the complete Borla cat-back system, again, whether it's the Touring, the S-Type, or the ATAK, there is going to be no modification needed to get everything up and running with the headers. And I just wanna make that perfectly clear here, guys, so there are no surprises when buying and, ultimately, installing. But I did briefly mention that Borla quality has been carried over from their cat-back exhaust systems to the XR-1 long tubes here, and that is certainly another huge plus when considering these particular long tubes. And what does that mean to you? Well, quality materials is a biggie. Sixteen gauge, 304-grade stainless steel throughout, including your laser cut 3/8 inch flange, the 1 3/4 inch primaries here which are gonna be your runners, and they have been left in that raw or natural finish, if you will, which should bronze up nicely after a few heat cycles. I also like how the XR-1s from Borla don't include a number of different pieces to make up each primary. Instead, most, if not all, with the exception of this guy right here, do feature a one-piece primary, from the flange all the way down to your 2 3/4 inch collector. And why do I like this? Well, any time you add a weld on a part that heats up and cools down frequently, like a header, it's just another area that is prone to cracking over time. So Borla and their one-piece primaries tend to alleviate that concern, in addition to the welds just being very smooth and very nice throughout. Great penetration and nice and smooth here at the head side, which is what you want. Listen, you don't want a rough weld to create a bunch of turbulence, especially this close to the head, because the key to a good exhaust system is maintaining exhaust velocity, and it seems like the welds here shouldn't introduce any extra turbulence to your exhaust flow. And then you have that 1 3/4 inch primary size or diameter, which will be one of your most common offerings or diameters in the Coyote aftermarket, along with your slightly larger 1 7/8 inch diameter. And look, guys, they're both gonna make great power over the factory manifolds you are replacing. But conventional wisdom might tell you that the smaller diameter primary will make slightly better torque at lower RPM levels, but be more of a restriction at the upper RPM level, especially as your power numbers start climbing. And what I will say is, guys, the difference for most setups is going to be pretty negligible. However, if you are leaning towards a forced induction setup, I might steer you towards the 1 7/8 inch primary in addition to a slightly bigger collector overall, but again, that's totally your choice. Speaking of making power, ideally, I would recommend pairing up these long tubes with a custom tune, not only to help you maximize your gains, but more importantly, to take into account the fact that you will be eliminating the cats with the off-road headers that we have here. Now if you don't, your secondary O2 sensors will probably trigger that "Check Engine" light once they realize the cats are no longer there. But let's move into the install briefly here, gang. And let me just tell you, this one most certainly will not be fun. Listen, long tube headers are always going to peg the difficulty scale, and the Borla's are no exception there. So expect a full-blown three outta three wrenches on the difficulty meter and at least a day or two in the shop or garage, depending on your expertise and your setup. Definitely recommend a big old set of tools for this one, along with doing this on a lift to make your life a whole lot easier. Now typically, you'll find three different schools of thought here. Number one, drop that to gain access. Number two, support the trans and the motor and drop the motor mounts. Or number three, just take it to a shop. But in all seriousness, guys, if you're not comfortable at tackling this in depth of an install, you might wanna contact your local speed shop. I'm sure they'll be happy to help you out with this job. So in closing, the Borla XR-1 Long Tube Headers are going to be an extremely nice albeit a tad expensive option that will work best with a Borla cat-back of your choice. Be sure to check out a set for your ride right here at

    Product Information

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


    • Increases Horsepower and Torque
    • Long Tube Header Design
    • Free Flowing 1-3/4" Mandrel-Bent Tubing
    • Stainless Steel Construction
    • Natural Finish
    • For Off-Road, Track Use
    • Fits 2011-2014 5.0L GT and BOSS Mustangs


    More Horsepower And Torque. Improve the performance of your 5.0L coyote Mustang throughout the entire RPM band with a set of Borla Long Tube Headers. These Borla Headers will greatly improve your 5.0 Mustangs exhaust flow over the restrictive factory manifolds to increase your Pony's horsepower and torque. Significant increases in rear wheel horsepower have been seen when installed with a matching Borla ATAK Cat-Back System.

    Quality Construction. Borla Long Tube Exhaust headers are CNC mandrel bent from 1-3/4" 16 gauge aircraft-quality T-304 stainless steel tubing for unrestricted airflow. They feature one piece 3/8" header flanges for added strength, leak-free performance and an OEM style fit.

    Recommended Upgrade.
    To realize the full power potential that these Long Tube Headers have to offer, AmericanMuscle recommends a custom tune with a Mustang Handheld Tuner to reprogram the vehicles computer (ECU) for proper operation.

    Required Upgrade. The Borla XR-1 Long Tube Mustang Headers will require the use of a Borla ATAK, Borla 'S' Type, or Borla Touring system with included X-Pipe for proper installation (See drop down option above).

    Application. These Borla XR-1 Long Tube Headers are specifically designed to fit the 2011 to 2014 GT and BOSS 302 Mustangs equipped with the 4 valve 5.0L coyote engine.

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


    CA Residents: WARNING: Cancer and Reproductive Harm -

    Installation & What's in the Box

    Installation Info

    What's in the Box

    • (1) Driver side header
    • (1) Passenger side header

    Tech Specs

    Header Specifications
    Header Type: Long Tube Finish: Natural
    Type Mid Pipe Required: ATAK Cat-Back with X-Pipe Fitment: 2011-2014 5.0 GT Mustangs

    Customer Reviews (22)

      Questions & Answers

      10 More Questions