Porsche 981 Cayman GT4 Sport Headers

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Why We Choose HJS Catalytic Converters: 

HJS German imported catalytic converters are made from some of the highest grade materials you can find in a catalytic converter. This yields high performance gains and longevity so it wont deteriorate over time like lower grade catalytic converters. These catalytic converters flow up to 93-95% of a straight pipe in most applications. The benefit is that you get the "straight pipe sound" while still being able to provide enough emissions scrubbing to prevent a check engine light.    

Low-end power and sound that you can enjoy every day! The perfect complement to either the factory exhaust system or Fabspeed’s performance exhaust systems, these high-flow headers are designed around HJS catalytic converters, making them the best upgrade for more enjoyable street driving and emissions compliance. 

Designed with noticeable street performance in mind, these Sport Headers provide an additional 26 whp and 39 ft/lbs of torque at 3600 RPM. This translates to significantly better acceleration and throttle response when powering away from a stop light or merging onto your favorite highway. Thanks to the world-class performance of the HJS catalytic converter cores, your GT4 stays emissions-compliant in most regions and will not throw a Check Engine Light.

In addition to the performance gains, Fabspeed's GT4 Sport Headers also add great character to the exhaust note by improving the overall volume and tone.

Power... Sound... No CEL... What's not to love?

  • Fits all Porsche 981 Cayman GT4 / Boxster Spyder vehicles (2015-2016)

  • Includes German-imported 200-cell HJS Sport Catalytic Converters for maximum performance and reliability

  • Adds 26 whp and 39 ft-lbs of torque at 3600RPM, providing significantly better performance during street acceleration

  • Constructed from equal-length T304 stainless steel C.N.C. mandrel-bent tubing for improved torque and equalized engine pulsing

  • Optimized for maximum performance with NO check engine light, guaranteed

  • More power and torque across the RPM band and dramatically improved exhaust sound

  • Direct replacement for the OEM headers with no cutting or welding required

  • Includes multi-layer exhaust manifold gasket

  • All Fabspeed performance products are backed by the Fabspeed Lifetime Warranty

INSTALLATION NOTE: To ensure proper header seal, after initial heat cycle, tighten all exhaust bolts to the OEM torque specs.


DISCLAIMER: This product removes the OEM catalytic converters from the vehicle, and as such, is strictly intended for closed track events and off-road use only. This product contains a High-Flow Sport Catalytic Converter solely intended for track and race cars as it is NOT California Air Resources Board Certified and not EPA certified. You are hereby informed and warned to check your local, state, and federals laws before buying and installing these or any aftermarket parts to be sure whether usage is in violation. All installation-risk and use-risk is borne by the end-user and installer of these parts.


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4 Reviews

  • 5
    Love It!

    Posted by Francis William on 24th Jun 2016

    Really like the sound of it. Music to my years, it kept the original porsche flatsix noise in the lower rev with slightly more volume, in higher rev it just screams like what it should in the first place. Makes revving it even more enjoyable then before. Love it!

  • 5
    Best part is the sound!

    Posted by Electron Mike on 6th Jun 2016

    I finally had time to finish the Fabspeed header install, and I went for a short drive. Immediately I noticed a nice mid range power improvement, and better/smoother throttle response. But the best part is the sound! It is louder at WOT, however it is the note and detail that is improved. It's a higher pitch that screams nicely toward redline.

  • 5
    No doubts here. Not a single one.

    Posted by Stephen on 16th Mar 2016

    After reviewing every forum, website, YouTube clip and consulting friends from the Porsche community (US and abroad) the decision was made to go for the Fabspeed Sport Headers. Some people just go for something, I actually enjoy the process and getting to know as much as possible about something before going ahead. Some aftermarket exhausts sound screamy (you know who you are Mr Schmee), uninteresting or plain loud. I wanted to expand on the glorious standard noise the GT4 makes. More flat crank 6, more depth, more character, more Porsche GT4… Ordering them was very straightforward and John Gaydos from Fabspeed was always at hand to help with any queries I had, and was very open and candid about what I could expect. Delivery took just a few days and the very well packed system arrived in perfect shape. Of course I couldn’t wait to get the headers installed, but unpacked them anyway to have a look before they would ‘disappear’ under the car and get to work. The headers are obviously a very well made item, with a lot of important little details one could overlook: very smooth intakes, the welds are top notch, everything is perfect. The stainless steel is the best quality used on cars, and it shows. The headers gleamed – so much so, that my wife even liked the look of them. Installation (I did not do this myself) was very straightforward, apart from one bolt on the drivers’ side. That one took about 2 mins – the rest was even easier. All-in all about 2 hours – with the guys being very careful. The company that installed the headers actually makes complete bespoke exhausts for dune buggies and other off road machines, and were very impressed by the quality of the Fabspeed headers. Comparing them to the Porsche headers, there are a two very noticeable differences: weight and finish. Despite the Porsche units obviously being very good, the Fabspeed ones are of a much higher standard. The welds, quality of the steel, general fit and finish are a big move up. Weight wise, I would say that the Fabspeed units are 25 to 30% lighter. I was quite surprised at the difference. Sound – now it gets interesting. The standard GT4 Porsche Sport exhaust will satisfy many people. The sound is deep, broad, but I always felt it was lacking character: at any given rpm, it sounded similar. I wanted a varying sound across the rev range and a bit more of it, yet keeping the deep growl. Hence Fabspeed. Anyway: driving home after getting the headers installed (and heated up) I couldn’t stop listening to all the new and wonderful noises. It was like listening to my favourite music cd, but instead of hearing it on a smartphone, here it was being played on a Burrmeister high end audio system. There was not just more of it, but there were infinitely more little pops, crackles, fizzes and so on. The down changes either with heel ‘n toe or with the (quicker) ‘Sport’ system on the GT4, the noise is faster, louder and the overrun is tremendous. You get seconds (even after coming to a stop) of burbles… The noise is deep and wide, with a very quick snappy gunshot-like quality to it. It really is like a Cup car changing down (shame we don’t get the flames). From 2nd to 1st is magnificent – and changing at higher rpm is gives different sounds than changing down a lower revs. Great. On acceleration the sound goes from a deep growl (but more of it), grows to a tremendous visceral whail, and ends in a full blown race car noise. Very nice indeed. Hairs will stand up. And these are not my comments, this is by other people who own Porsche giving me this feedback. The other very noticeable aspect is that the power delivery, especially from lower revs is a lot smoother. The infamous torque dip is gone… It makes for a nicer experience and the top end seems to arrive that bit sooner (though that is hard to quantify as I have done no formal testing). So the car has gained a bit more oomph. Can’t complain at that… Inside the car you get to hear all little things that are going on, every rev is different and the sounds are different for every gear. So you end up playing with the gears not just because that is pure fun anyway, but now you also get the sounds that go with it. It can be loud, but in a nice and race car loud – big and fast, not screamy and ‘empty’. There is a lot of substance to the volume. I do drive with the valves closed (similar level then, than with the standard headers and valves closed) at night in my neighborhood, but that it just being a respectful. At all other times, the windows are down and the fun never stops. Driving between buildings is great fun, with each of those downshifts creating a shockwave of wonderful race car sounds. So if in doubt, and you want more (race car) sound, keeping the original character of the car yet giving more depth and aiding the torque dip. Go for this.

  • 5
    I can't think of a more satisfying, or a better smile modification. So very happy for the money well spent.

    Posted by Alessandro on 8th Feb 2016

    All I can say is that the sport headers are mounted on the car, and I am blown away. The pickup, the way it revs more freely, the massively more instant throttle response, such an awesome modification. The sound.. Hahahahaha.... It's ******* amazing. Basically, PSE off is now obligatory in the city, truly... (PSE on should be illegal in urban areas.). With PSE off the sound is quiet with a little more texture and what most would consider a beautiful sounding exhaust all by itself. It's quiet like stock, everything is muted like with stock headers, maybe just a tiny notch more volume but with more specific sounds.. Like the engine is breathing through multiple pipes. . In PSE ON, I have a belly laugh on downshifts in sport mode.. It's my own little lemans racer. And up-shifting is pure race car..Pure screamer. this is like a whole new car. unreal.. The mechanics couldn't stop talking about the casting, and the quality of the system... The fact that the attachment plate is thick and warp resistant, cast in a single piece with the beginning of the pipes so as to maximize strength. Interesting to notice how the stock ones are pipes attached at their base to the plate, much weaker setup. My only disappointment is that I'll never see those beautiful headers again as they are hidden beneath my car. Heading to Alice's on skyline drive for a Porsche meet early tomorrow am... If this isn't the best sounding car there, I'll be shocked.

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