Project 987.2 Cayman S: Getting More Out of the Engine to Chase the GT4 Part 2

The Fabspeed exhaust also goes together with slip joints and stainless steel clamps just like the the stock Porsche exhaust.

The OEM hangers are bolted back to the Fabspeed exhaust.  The O2 sensors are reinstalled at this point too.  The valvetronic valve vacuum lines are connected to the control box and manifold vacuum as well.

With great looks, less back pressure and less weight our system is going to be a winner. With the Fabspeed headers and exhaust in place it is now time for our next round of mods on the intake side of the engine. Once that’s done, it will be time to dyno tune our 9A1 and PDK transmission and see how we stack up against the GT4!  Stay Tuned!


Fabspeed Motorsports



  1. I’m sure there’s a reason, I’m just curious why the vacuum actuators weren’t placed closer to the muffler bypass T-section.

    1. That is about the only place they could be to divert the flow to either though the mufflers or the bypass.

      1. The length of pipe leading up to the bypass valve probably works as a Helmholtz resonator to additionally reduce drone. Or not.

        1. This is my thought as well, I wish I had time to experiment with Helmholtz resonators on my own cars, but seeing little stubs like this absolutely makes me think that’s at least part of the reason for their placement.
          I’d imagine with the length being so short (12-18″?), it might help cut out rasp more than drone, but it should provide some effect without hurting exhaust flow (and power) too much at lower loads….

          1. The thing is the bypass is open on both ends so it’s not a Helmholtz resonator. Having two exhaust paths of different lengths does change the frequency and possibly cancels out some frequencies though and the exhaust isnt as loud as you would think when its open

  2. Curious question, so, when you are performing the modifications to your Cayman, is this a road legal car? Or is this track use only? I would like to think it’s a track only car not to be used on the road?Iif not, the removal of the catalytic converter would be a big EPA issue?

    1. It is a track car. It says so in the articles about this project and twice in the first paragraph in this article.

      1. But you’ll be comparing it to the GT4 power-wise…which still has full emissions?

        A bit of apples to oranges comparison, no?

        1. This is a track car, not a street car. Plus a GT4 is tens of thousands of dollars more. A GT4 Clubsport is over a hundred thirty thousand more and we think we can come very close to this, perhaps exceed it in some aspects.

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