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  • Fabspeed's GT450 Performance Package is the final answer in GT4 performance. Delivering over 400 horsepower to the wheels with easy-to-install bolt-on upgrades, there is no better option for the GT4 owner seeking the maximum power and performance. No need to swap engines or suffer long periods of downtime during a full engine re-build. Simply install the GT450 Package and begin outperforming the 911 Carrera GTS the very next day!
  • Fabspeed's GT450 Performance Package for the Porsche Cayman GT4 adds over 53 whp at the top-end and over 65 ft/lbs of low-end torque.
  • Fabspeed's Valvetronic Exhaust System is the ultimate catback setup for the ultimate streetable track car.
  • The GT4 Valvetronic Exhaust valves are controlled by the factory exhaust button on the center console. Two unique exhaust tones in one system; the choice is yours at any time.
  • We use the best materials from all over the world - including valves from Helical Technology based in the UK. These are the world's best valves, used by OEM manufacturers such as Porsche, Lamborghini, and Ferrari.
  • Fabspeed’s Race Headers for the Porsche Cayman GT4 will get you out of the corner fast and maximize your pulling power on the straights! Designed for maximum power applications, these catless longtube headers provide optimal exhaust flow from the engine cylinders straight into the exhaust system.
  • The perfect compliment to Fabspeed's GT4 exhaust upgrades, this high performance intake plenum from Innovative Pro Design and upgraded 82mm throttle body provide substantial power gains by increasing the efficiency and flow of the engine's air intake system.
  • The IPD Plenums improves intake air flow and increases air velocity. The “Y” shape design and dimpled interior surface makes air flow more laminar (less turbulent) dramatically improving power and torque across the entire RPM band.
  • The Accessport V3 is the world's best selling, most flexible ECU upgrade solution for Porsche. Unlock power hidden within the vehicle by replacing conservative factory settings with more aggressive calibrations. Upgrade forever with off-the-shelf (OTS) calibrations for most bolt-on modifications. The new in-cabin mountable Accessport V3 has a large, full color, higher resolution screen which allows you to monitor up to six parameters in real time. Fully customizable from the look (multiple bezel colors), layout (set up a race, street or dyno gauge cluster) and mounting options (choose from 1,000s of standard vehicle mounts). Of course, all of the great COBB tuning is included - with enough space for 100 calibrations.
  • This GT450 Package equipped GT4 sees plenty of track time. The Valvetronic exhaust has been modified (valve delete and our Turn Down Tips) and meets the sound limits at Lime Rock by 2-3 dB's.
  • We're happy to offer a new alternative tip option for our Valvetronic Exhaust System. Each set of Single-Wall Tips is hand built out of stainless steel and hand finished with pride at Fabspeed Motorsport.
  • You can also opt for a full polish finish for the GT4 Single-Wall Tips
  • Our carbon fiber tips are authentic carbon fiber which will withstand heat for a long lasting beautiful finish
  • Our carbon fiber tips are authentic carbon fiber which will withstand heat for a long lasting beautiful finish
  • Fabspeed's Brushed Single-Wall Tips installed on a Porsche Cayman GT4

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Porsche Cayman GT4 Fabspeed GT450 Race Performance Package (2015-2016)


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  1. I could not be happier! 5 Star Review

    Posted by on 2nd Jun 2016

    Been meaning to write you....YES, she's totally bitchin!!! Ya'll did an AWESOME job! She really sounds AND looks great! Those stainless tips are fabulous!
    I could not be happier! The Fabspeed valvetronic exhaust with the sport headers are absolutely THE way to go on the GT4. No question. I love being able to tone her down with the push of a button. Makes it easier to bring her quietly back into the neighborhood without shaking the windows....and when it's time to cut loose, the exhaust note is right there, perfect!
    PLEASE let everyone there at Fabspeed know that ya'll did a wonderful job on my GT4. I'm extremely grateful and PROUD to have another fine Fabspeed package on my new GT4.

  2. Nothing short of astounding! 5 Star Review

    Posted by on 29th Mar 2016

    Purchased my 2016 gt4 about 3 weeks ago. I put on about 100 miles and realized I wanted a bit more low end torque and overall horsepower to compensate for the tall gearing. I researched an option to have a stroker kit added, but couldn't trust that the tuner would back the motor and didn't want the risk of losing my warranty. So, I decided to go with bolt ons and a custom tune.

    I contacted Fabspeed and spoke with Bobby. I had a very small window to have the mods done, due to business travel priorities. Bobby assured me that they could get it done on time. He was very thorough with answering all my questions and concerns. I decided on their gt450 package(Race Headers, Full Exhaust w/ Carbon Tips, BMC Air Filters, IPD Plenum, 82 mm gt3 Throttle Body and most importantly, the Cobb custom tune).

    When I arrived last Tuesday, my car was checked in and I was given a full tour of their shop. I was very happy to see that they fabricate the headers and exhaust, in house! The plan was to pick it up Friday, completed. Bobby sent me a video on Thursday,of them testing my car on the dyno, along with the results printout. My car produced 396 hp and 327 tq. My engine is not fully broken in yet(Only 250 miles at the time), so I am expecting to gain another 7-8 hp and 3-4 tq, once I have a few thousand miles on it. They invited me back for another dyno at that time. Their tuner, Steve, is very experienced/knowledgeable. He did a custom tune on my car and I must say, it's very crisp and aggressive! Steve explained that he always continues to work the tunes he does. He will contact me and send any improvements in the future, via email, if he gets any more gains.

    I picked up my car last Friday. My car was well taken care of and was up on the lift when I arrived, so that I could see all that was done to it. The installation was 100% complete and very nicely installed. The exhaust valves are controlled by the exhaust button, on the console. The sound difference is noticeable as soon as the car is started. I had a 2 hour ride back to New Jersey. The performance from this kit is nothing short of astounding! It has torque way down low and the power pulls and pulls and pulls to just about 8000 rpms!!!

    I have owned some amazing cars with amazing sounds(2010 & 2015 Porsche gt3;s, 2011 Porsche gt3rs with Sharkwerks center exhaust and 2009 Ferrari 430 Scuderia).The gt4 with this kit, sounds better than any car I have owned, imho!

    I would like to thank Fabspeed, Bobby, Steve and all team members involved in this build for an excellent job, well done!!

  3. HOLY COW!! 5 Star Review

    Posted by on 15th Mar 2016

    Porsche GT4 + Fabspeed + Full Race Exhaust + Oversized Throttle Body & Plenum + Race Map = Total Rip Snort = Out of body experience

    I'm not sure how much is my imagination, but that thing sure feels like 400whp.

    You guys rock!

    Thanks, David

Product Description

Fabspeed's GT450 Race Performance Package is the final answer in 981 Cayman GT4 / Boxster Spyder performance. Delivering over 400 horsepower to the wheels with easy-to-install bolt-on upgrades, there is no better option for the GT4 or Spyder owner seeking maximum power and performance. No need to swap engines or suffer long periods of downtime during a full engine re-build. Simply install the Fabspeed GT450 Package and begin outperforming the 911 Carrera GTS the very next day!                      

After months of development, Fabspeed is proud to offer our complete power solution for the GT4. With a crowd of Porsche Club of America members looking on, we eclipsed the 400whp mark on our Dynojet. Our esteemed tuner has extracted power from thousands of vehicles, and has proven that the GT4 and Spyder have untapped potential when paired with our suite of performance components. Get the ultimate sound and power upgrade for your GT4 or Spyder and dominate the track or street.


gt4-vt.jpg   Porsche Cayman GT4 Valvetronic Exhaust System
gt4-rh.jpg   Porsche Cayman GT4 Race Headers
gt4-ipe.jpg   Porsche Cayman GT4 IPD Competition Plenum Package
gt4-fil.jpg   Porsche Cayman GT4 BMC F1 Replacement Air Filters

gt4-ap.jpg   Porsche Cayman GT4 Cobb Accessport Tuner with GT450 ExperTune


  • Fits all Porsche 981 Cayman GT4 / Boxster Spyder models (2015-2016)
  • Instantly eliminates all symptoms of Carrera envy
  • Side effects may include extreme euphoria and uncontrollable excitement. In some cases, users have experienced acceleration-induced tunnel vision.
  • Adds significant power all throughout the rev range with an additional 53 whp at 6400 RPM and over 65 ft/lbs of torque at 3600 RPM
  • Choose between real matte Carbon Fiber tips or Single Wall Stainless Tips that are made in house for a racecar look
  • All parts are easily installed with no cutting or welding required, bolt on and go.
  • The Cobb Accessport gives you easy control over tuning your GT4 or Boxster Spyder, we send all documentation for uploading the GT450 flash to your vehicle upon purchasing
  • All Fabspeed performance products are backed by the Fabspeed Lifetime Warranty


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


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 is or contains a Racing Cat Bypass Pipe, which will give you check engine lights on OBD2 cars. We suggest pairing this product with racing software to prevent fault codes and check engine lights. Racing Cat Bypass Pipes are solely intended for track and race cars as they are 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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