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Pypes 1-7/8-Inch Long Tube Headers; Catted (18-21 GT)

Item 405534
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$1,286.51 (set)

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      Video Review & Installation

      The Pypes 1-7/8-Inch Catted Long Tubes might just be one of the best values on the site currently for your 2018 and newer Mustang GT, thanks to the killer build and materials for a relatively affordable price. Now, prospective buyers can look forward to the inclusion of high flow cats, premium 304-grade stainless steel throughout, and a unique stepped runner design, all for right around a thousand bucks. Install will be a test for most novice mechanics out there, so let's call it a full pull, three out of three wrenches on the difficulty meter, and a day or two to get everything completed.So I'm sure a lot of you guys know Pypes as more of an entry-level or budget-friendly option, and that might scare you away a little bit, but, I will say, full disclosure, the company has gotten a lot better in recent years, and that really shows with their S550 long tubes. Quality build, quality materials, and again, for a really affordable price. But what do you say we break these things down a little bit further and let's start with those materials, because you are working with that premium 16-gauge 304-grade stainless, which is essentially gonna be the same material a lot of your other more premium manufacturers will utilize with their long tubes. That does include the 3/8-inch laser cut flange here at the head. All of your primaries, which have been mandrel-bent, we'll talk a little bit more about these guys in a second, and then everything is gonna end in that 3-inch merge-style collector, loaded with the power spike technology. And that's something a lot of aftermarket manufacturers have been incorporating into their Coyote header. And the idea behind that is to help increase the scavenging with the exhaust system.But going back to the primaries as promised guys, and these are yes a 1-7/8-inch option, or at least that's how they're labeled. But technically, they're gonna be more of a step design, meaning they gradually step up in size, working away from the head flange. For instance, you got a very small amount of 1-3/4-inch primary before it does step up into that larger 1-7/8-inch runner, finally meeting at that 3-inch collector. Now, stepped headers really aren't a new technology, they've been around since the old hot rod days. And the idea there again is to help increase your exhaust velocity, which is always a priority when building a header, in addition to help deliver a slightly broader power band. Now granted, it's not gonna be night and day, but you're gonna get some of the smaller torque benefits of the low end, thanks to the smaller primary, while that top end is still gonna be strong thanks to the larger runner, which, let's be honest, does make up I'd say 75% to 80% of the header itself.Again, very minor differences, but should be noted as it is pretty unique in the category. But aside from the header itself, I do want to spend just a little bit of time talking about some of your connection options with the Pypes long tubes, because Pypes is currently offering you three different variants of their '18 and newer Mustang GT header, the only difference being down here with the connection pipes themselves. So again, the set we are talking about in this video are the catted option as opposed to an off-road or catless option. And yes, it's going to be a better bet with emissions obviously, but at the cost of maybe a little bit of power, a little bit of noise, but honestly, it's not the end of the world. I do also want to point out, this is very important, that the catted options do utilize a factory-style neck-down connection, meaning you cannot use this with a performance connect catback, you do have to use this with either your factory catback or an aftermarket system that's going to incorporate that neck-down style connection. But because there are cats in the equation here guys, running a tune isn't a necessity, but would still be recommended when looking to maximize the gains of the headers themselves along with the rest of your setup. As far as just how much power you can expect, well that's gonna vary depending on a few different factors, including your tune if you do add one, along with your existing modification. So, I'd say anywhere from 10 to 20 wheel is what I usually tell people, and that should be the same case here with the Pypes catted version. Let's briefly talk about the install. And in a nutshell, it's not gonna be a fun one, right? Three out of three wrenches on the difficulty meter is what you should be expecting, at least a day, maybe two, depending on your setup and your expertise. Now, I will say the S550 engine bays do have a little bit more room to maneuver under the hood compared to an S197 for instance. So, if you've done a set on an S197, you should be in for a slightly easier job with your S550.Nevertheless guys, factor in a solid set of tools, at least a day in the garage, and if you're not comfortable with tackling something like this, might want to give your local shop a call instead. But wrapping things up here guys, if you're looking for one of the best values again on the site in the land of aftermarket catted long tubes for your S550 GT, I'd say you have to check out the Pypes 1-7/8-Inch options right here at

      Product Information

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


      • Maximum Power and Torque Gains
      • Aggressive Exhaust Note
      • Performance Catalytic Converters Mid-Pipe Design
      • Primary 1-3/4 Inch Piping Steps Into 1-7/8 Inch Pipe, Ending at a 3 Inch Collector
      • Heavy-Duty Stainless Steel Construction
      • Ideal for Track Use
      • Tuning Required
      • Wiring Harness Needs to Be Disconnected from the Back of the Block for Appropriate Length
      • Fits All 2018-2021 Mustang GT Models


      Practical Power Boost. Get a practical power and torque boost for your Mustang GT with the Pypes 1-7/8-inch Long Tube Catted Headers. These long tube headers feature a “step” design wherein progressively larger piping is used at certain sections of the header, with the intention of allowing exhaust gases to leave your coyote engine faster, resulting in greatly diminished back-pressure and an increase in overall performance numbers. These headers benefit naturally aspirated engines, but can also be used with some of aftermarket engine mods.

      An Exhaust Note with Attitude. The Pypes 1-7/8-inch Long Tube Catted Headers doesn't just make your Mustang perform better, but sound better as well. This header system produces an attitude-filled exhaust note that starts at a low rumble during idling and builds up to a loud roar that’s on the deeper end of the sound spectrum. This exhaust note is sure to send shivers down the spines of the competition on track day.

      Performance Cats. The Pypes 1-7/8-inch Long Tube Headers include performance catalytic converters. These high-flowing cats will perform the job of a standard cat but in a less-restrictive manner. The high flow, less restriction provides your Mustang with the incredible performance boost.

      Heavy-Duty Build Quality. The Pypes 1-7/8-inch Long Tube Headers are crafted from heavy-duty stainless steel for strength and resistance to corrosion. The pipes are completely mandrel-bent for added rigidity less turbulence. The headers’ specialized “step” design starts out with a 1-3/4-inch diameter pipe, into a larger 1-7/8-inches, and finally ending with a 3-inch wide collector with all the joins being TIG-welded for strength.

      ECU Re-Tuning Required. While installing the Pypes 1-7/8-inch Long Tube Catted Headers will produce performance gains, it is required that an ECU re-tune be performed on your Mustang. This is to ensure that your engine and the new header system are truly in sync with the optimal performance gains.

      Installation. The wiring harness needs to be disconnected from the back of the block. That should give you enough length for a proper installation.

      Application. The Pypes 1-7/8-inch Long Tube Catted Headers fits all 2018-2021 Mustang GT models.

      Fitment: 2018 2019 2020 2021 Details

      Pypes HDR79SK-1

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (2) Long Tube Headers
      • (2) Catted Mid Pipes
      • Installation Hardware

      Customer Reviews (16)

        Questions & Answers

        10 More Questions

        Will It Fit My Mustang

        • Bullitt - 19, 20
        • GT - 18, 19, 20, 21
        • Mach 1 - 21