Few bolt-ons wake up a Mustang GT like a proper set of headers. The factory cast manifolds are restrictive by design, choking your Coyote or 4.6 right where it wants to breathe. Swapping them for long tubes or shorties frees up trapped exhaust gas, sharpens throttle response, and unlocks a deeper, more aggressive note that the stock setup simply cannot deliver. The difference is real and you feel it the first time you get on it.
We pulled together the seven header sets that GT owners actually run and trust, covering both the S550 and S197 5.0 platforms along with the 4.6 Three Valve cars. Each one here is a genuine, widely sold product on Amazon, picked for fitment, dyno-backed gains, and how well the welds and flanges hold up under heat cycling. Whether you want maximum top end from a full long tube setup or an easier install with shorties, there is a set below that fits your goals and your budget.
| Photo | Product | Score | Buy |
|---|---|---|---|
 |
BBK 1633 1-3/4 Long Tube Headers Mustang GT 5.0 Best Overall 1-3/4 in primaries, full long tube, ceramic coated, fits 2011-2014 GT 5.0 |
9.5 | 🛒 Check Price |
 |
Kooks 1151H210 1-7/8 Long Tube Headers 2015-2017 Mustang GT Best for Big Power 1-7/8 in primaries with catted 3 in connection pipes, 304 stainless, S550 GT |
9.4 | 🛒 Check Price |
 |
American Racing Headers MT5-15134300LSWC Long System 2015-2017 GT Best Stainless Build 1-3/4 in long tube full system with x pipe, 304 stainless, S550 5.0 |
9.2 | 🛒 Check Price |
 |
BBK 16340 Shorty Tuned Length Headers 2011-2014 Mustang GT 5.0 Best Shorty 1-5/8 in shorty tuned length, ceramic coated, bolts to factory mid pipe |
9.0 | 🛒 Check Price |
|
JBA 6655S Cat4Ward Shorty Headers 2011-2017 Mustang GT 5.0 Easiest Install 1-5/8 in shorty, 409 stainless, smog legal in many states, 5.0 Coyote |
8.8 | 🛒 Check Price |
 |
BBK 1631 1-5/8 Shorty Headers 2005-2010 Mustang GT 4.6 Best for 4.6 3V 1-5/8 in tuned length shorty, ceramic coated, fits 2005-2010 GT 4.6 Three Valve |
8.5 | 🛒 Check Price |
 |
Flowtech 11900FLT Long Tube Headers Mustang GT 5.0 Coyote Best Value Long Tube 1-3/4 in long tube primaries, ceramic coated mild steel, S197 GT 5.0 |
8.2 | 🛒 Check Price |
1. BBK 1633 1-3/4 Long Tube Headers Mustang GT 5.0: Best Overall
BBK has built long tubes for Mustangs longer than almost anyone, and the 1633 set shows why they stay the benchmark for the 2011-2014 GT. The 1-3/4 inch equal length primaries are the right size for a naturally aspirated or mildly built Coyote, keeping velocity up low while opening the top end wide. On a tuned car you can realistically expect a solid bump at the wheels, and the gains arrive across a usable band rather than only at redline. The throttle gets noticeably crisper and the exhaust note picks up that hollow long tube rasp that GT owners chase.
The honest weakness is the install itself, which is true of every long tube. You are dropping the steering shaft, wrestling tubes past the K member, and you will want an off road mid pipe and a tune to make the most of it. Budget a weekend or a shop visit. The ceramic coating is excellent but can show wear at the collector over many heat cycles if you run the car hard on track. For a street and strip GT though, this is the set we would buy first.
- 1-3/4 inch equal length primaries flow into a 3 inch collector for strong mid to top end gains
- Durable silver ceramic coating reduces underhood heat and resists rust over years of use
- CNC machined flanges seal flat against the head to prevent the leaks cheaper sets develop
Pros: Among the strongest dyno gains in this comparison on a Coyote 5.0; Ceramic coating holds up far better than raw or painted tubes; Bolt up quality and flange thickness are genuinely excellent
Cons: Long tube install is involved and usually needs a tune and mid pipe; Not 50 state emissions legal, so off road or track use only in many areas
2. Kooks 1151H210 1-7/8 Long Tube Headers 2015-2017 Mustang GT: Best for Big Power
When a GT owner steps up to a supercharger or a stout naturally aspirated build, Kooks is the name that comes up again and again. The 1151H210 set uses fat 1-7/8 inch primaries that are sized to feed real horsepower on the 2015-2017 S550 5.0. The 304 stainless construction and beautifully consistent TIG welds mean these will outlast the car, and the included catted connection pipes let you run them on the street without the harsh raw smell or constant check engine light that catless setups bring.
The trade off with primaries this large is that a bone stock motor will not fully take advantage of them, and you may notice slightly softer response down low compared to a 1-3/4 set. These shine once you add boost or displacement. They also represent the bigger investment here, but the metal quality and longevity justify it for a build that is going to keep growing. If your GT is headed past the 600 horsepower mark, this is the smart long term choice.
- 1-7/8 inch primaries built for boosted and heavily modified S550 Coyote builds
- 304 stainless steel construction resists corrosion better than mild steel or coated tube
- Included high flow catted mid pipe keeps it street friendly while still flowing big numbers
Pros: Handles serious power, ideal for supercharged or built 5.0 cars; 304 stainless and TIG welds are about as good as headers get; Catted connection pipes help with street manners and odor
Cons: Larger primaries can soften very low end response on a stock motor; Premium build means it sits at the higher end for value
3. American Racing Headers MT5-15134300LSWC Long System 2015-2017 GT: Best Stainless Build
American Racing Headers builds some of the most respected long tube systems in the Mustang world, and the MT5 long system for the 2015-2017 GT is a complete, engineered package rather than a header set you have to match yourself. You get the long tubes and the x pipe designed to work together, all in mandrel bent 304 stainless. The stepped primary design is the clever part, using a smaller diameter near the head to keep torque alive before opening up to support the top end. The result is a powerband that feels strong everywhere, not just at the far end of the tach.
Because it is a full system, this is one of the heavier spends here, and you do need a tune to clear the codes and realize the numbers. That is the only real knock. The fit and finish are outstanding, the welds are clean, and ARH stands behind the product. If you want one box that contains a proven, complete exhaust solution for your S550 and you plan to keep the car, this system earns its place.
- Complete long tube plus x pipe system engineered as a matched setup for the S550 GT
- Mandrel bent 304 stainless tubing keeps flow smooth through every bend
- Stepped primary design balances low end torque with strong top end pull
Pros: Full matched system removes the guesswork of pairing parts; Stepped tube design gives a broad and usable powerband; Heavy gauge stainless built to survive aggressive driving
Cons: Full system is one of the larger investments in this guide; Requires a tune to clear codes and unlock the gains
4. BBK 16340 Shorty Tuned Length Headers 2011-2014 Mustang GT 5.0: Best Shorty
Not every GT owner wants to drop the steering shaft and fight tubes through the K member, and that is exactly who the BBK 16340 shorty is built for. These tuned length shorties sit in the factory location and bolt right to your existing mid pipe, which turns a brutal long tube job into an afternoon in the driveway. You still get a real flow improvement over the restrictive cast manifolds, with a nice mid range bump and crisper throttle, plus the silver ceramic coating that keeps engine bay heat in check.
The honest reality is that shorties give up top end to long tubes. If your only goal is the biggest possible dyno number, this is not the set that wins that fight, and the sound change is more subtle. But for a daily driven GT where install ease and emissions friendliness matter, the value here is hard to beat. You get most of the breathing benefit with a fraction of the labor and headache, which is why so many owners start here.
- Tuned length shorty design fits in the stock location for a far easier install
- Bolts directly to the factory or aftermarket mid pipe with no extra fabrication
- Silver ceramic coating cuts underhood temperatures and resists corrosion
Pros: Dramatically simpler to install than any long tube set; Often passes visual emissions checks where long tubes will not; Solid mid range gain for the effort involved
Cons: Top end power gains trail a true long tube setup; Less dramatic sound change than long tubes deliver
5. JBA 6655S Cat4Ward Shorty Headers 2011-2017 Mustang GT 5.0: Easiest Install
JBA carved out a niche by making headers that real daily drivers can actually run without legal headaches, and the 6655S Cat4Ward shorty is the poster child. Built from 409 stainless and designed to keep your factory catalytic converters in place, this set carries 50 state or near 50 state emissions legality in many regions, which almost nothing else in this guide can claim. It is a true bolt on, no tune required, so you can install it on a Saturday and drive to work Monday with a clear conscience and a clear emissions check.
The compromise is right there in the design goal. By keeping the cats and using a conservative shorty layout, the power gains are the most modest in this roundup, and the exhaust note stays close to factory. If you crave the loud, raspy long tube sound or chase every last horsepower, look elsewhere. But for an owner who wants a legal, durable, install it and forget it upgrade that still improves flow over the cast manifolds, JBA delivers exactly that.
- Cat4Ward design retains factory catalytic converters and emissions equipment
- 409 stainless steel construction stands up to heat without rusting through
- Direct bolt on fit means no tune required to run them safely
Pros: Carries emissions legal status in many states, a rare advantage; Genuinely no tune needed for a clean, hassle free install; Stainless build resists rust far better than coated mild steel
Cons: Power gains are modest compared with long tube options; Sound stays fairly close to stock with cats retained
6. BBK 1631 1-5/8 Shorty Headers 2005-2010 Mustang GT 4.6: Best for 4.6 3V
The 2005-2010 GT with the 4.6 Three Valve is often overlooked, but its cast manifolds are genuinely restrictive, which means a good header set makes a real difference on these cars. The BBK 1631 is purpose built for the 4.6, not a Coyote part shoehorned in, with tuned length 1-5/8 inch tubes and the same silver ceramic coating BBK uses across the line. On a breathing limited engine like the Three Valve, improving the exhaust path is one of the better value moves you can make, and these wake the motor up without demanding a full long tube ordeal.
The ceiling here is set by the 4.6 itself. This is not a high revving Coyote, so the absolute power numbers will never match what the newer 5.0 cars see, and the shorty layout gives up some top end. Those are platform realities, not flaws in the product. For a 4.6 owner who wants better flow, a slightly meaner note, and a straightforward install, this is one of the smartest and most available upgrades on the market.
- Sized specifically for the S197 4.6 Three Valve, not a Coyote part forced to fit
- Tuned length tubes improve flow over the very restrictive 4.6 cast manifolds
- Ceramic coated finish keeps heat down and looks clean for years
Pros: One of the few quality header options for the 4.6 Three Valve; Easy shorty install with stock mid pipe compatibility; Noticeable wake up on the breathing limited 4.6
Cons: The 4.6 platform caps the absolute gains available; Shorty layout leaves top end on the table versus long tubes
7. Flowtech 11900FLT Long Tube Headers Mustang GT 5.0 Coyote: Best Value Long Tube
Long tubes usually carry a steep price, so the Flowtech 11900FLT exists to bring that breathing upgrade to owners who do not want to spend top dollar. You still get genuine 1-3/4 inch long tube primaries that flow well on a tuned S197 Coyote, plus a ceramic coating to manage heat and slow corrosion. For a budget conscious GT owner who wants the long tube powerband and that signature rasp without the premium spend, the value proposition here is strong and the gains are real.
You do make some concessions for the savings. This is coated mild steel rather than 304 stainless, so over many years and heat cycles it will not endure quite like a Kooks or ARH set, and the coating can wear at the collectors. Fitment is good but may occasionally need a little persuasion versus the dead on bolt up of the higher end brands. None of that is a deal breaker for a street car. If long tube performance on a sensible budget is the goal, Flowtech earns its spot.
- 1-3/4 inch long tube primaries deliver real top end flow at an accessible price point
- Natural metallic ceramic coating provides heat and corrosion protection
- Laser cut flanges help maintain a flat sealing surface against the head
Pros: Brings long tube gains within reach for a tighter budget; Coated finish offers decent heat management; Good flow for the money on a tuned Coyote
Cons: Mild steel and coating will not last as long as 304 stainless; Fitment can need minor massaging compared with premium sets
Frequently Asked Questions
Will headers on my Mustang GT require a tune?
Long tube headers almost always need a tune, especially when paired with an off road mid pipe, because they move or remove the rear oxygen sensors and change exhaust flow enough to throw a check engine light and run the air fuel ratio off. A tune clears the codes and unlocks the full power the headers can make. Shorty headers that retain the factory catalytic converters, like the JBA Cat4Ward set, can often be installed with no tune at all and still pass emissions. If you are going long tube, budget for a handheld tuner or a custom dyno tune as part of the project.
What is the difference between long tube and shorty headers?
Long tube headers use full length equal length primaries that merge into a collector well downstream, which maximizes scavenging and top end power but makes the install far more involved and usually requires a tune and an off road mid pipe. Shorty headers are compact, sit in the factory manifold location, bolt to your existing mid pipe, and install in a fraction of the time. The trade off is that shorties give up top end power and a more dramatic sound to long tubes. If you want maximum power, go long tube. If you want easy install and often emissions friendliness, go shorty.
How much horsepower do headers add to a Mustang GT?
Gains depend heavily on the engine, supporting mods, and whether the car is tuned. On a 5.0 Coyote, a quality long tube setup with an off road mid pipe and a proper tune can deliver a meaningful bump at the wheels, with the gains spread across the mid and upper rev range. Shorty headers produce smaller numbers, mostly in the mid range. The 4.6 Three Valve cars see less in absolute terms because the engine itself is more limited. Headers also tend to improve throttle response and torque feel in ways a single dyno number does not fully capture.
Are aftermarket headers legal for the street?
It depends entirely on the set and your local laws. Catted shorty headers that retain the factory catalytic converters, such as the JBA Cat4Ward, carry emissions legal status in many states and can pass a visual or sniffer test. Most long tube headers and any catless setup are sold for off road or track use only and are not legal on public roads in states with strict emissions enforcement like California. Always check your state and county rules before buying, and look for a CARB executive order number if you live somewhere with tough inspection requirements.
What primary tube size should I choose for my GT?
Primary diameter should match your power level. For a stock or mildly modified naturally aspirated Coyote, 1-3/4 inch primaries are the sweet spot because they keep exhaust velocity high for good low and mid range while still flowing well up top. Step up to 1-7/8 inch primaries only when you are running a supercharger, a built motor, or chasing big horsepower, since larger tubes on a stock engine can soften low end response. The 4.6 cars do best with the smaller 1-5/8 inch shorty tubes. Picking the right size for your build matters more than simply choosing the biggest pipe available.
Our Verdict
For most Mustang GT owners, the BBK 1633 long tube set is our top pick. It hits the ideal 1-3/4 inch primary size for a street and strip Coyote, the ceramic coating and flange quality are excellent, and the dyno gains are among the strongest here once you add a tune and mid pipe. If you are building toward serious boosted power, the Kooks 1151H210 is the runner up and the smarter long term choice with its fat 1-7/8 inch primaries and bulletproof 304 stainless construction. Owners who want an easy, tune free, emissions friendly upgrade should look hard at the JBA Cat4Ward shorty instead.
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