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  • Replaces the restrictive factory catalytic converters with much less restrictive straight-through pipes for maximum flow and performance
  • Porsche 958 S / GTS Secondary Catbypass pipes installed.

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Porsche 958 S / GTS Secondary Cat Bypass Pipes (2011-2014)


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  1. Awesome Product 5 Star Review

    Posted by on 2nd Dec 2019

    The pipes perform as claimed! Simple as that. Cats are the worst thing for an exhaust. Restricts all the airflow going out creating un-needed pressure. The added growl is a nice touch. The tone at heavy to WOT is very nice and noticeable. There is absolutely NO drone inside the vehicle. Cold starts are awesome. Also as claimed, NO CHECK ENGINE LIGHT!!! Dealer installed mine when it was in for maintenance and said there were no codes to clear. I couldn't be happier with how they perform. These work perfectly with the BMC air filters. Extra air in cat-less pipes to breath the air out. Couldn't be better!!!! Do your car a favor and get a set!

  2. Awesome product. 5 Star Review

    Posted by on 9th May 2017

    This definitely compliments the 4.8. Cold starts are a bit obnoxious. It sounds like a racecar idling, if i leave the exhaust open. I'm sure the neighbors don't like it, but they probably don't like the diesels either. All in all though, it's great while driving. With the exhaust closed it is still very tamed, but once opened its like all hell has broken loose. Letting off at high rpms is my favorite. To here the motor back fire brings the kid out. The sound the resonators kill, is probably what most enthusiasts are looking for. It also sounds amazing when the motor kills the power. Just a little, properly timed, throttle blip on gear changes, and you can wake the dead.

  3. Upgraded Exhaust Note 5 Star Review

    Posted by on 22nd Feb 2017

    Having gotten used to the sweet growl of the PSE and Sports Headers on my 2010 911 4S Cab, I was thoroughly disappointed with the stock exhaust note on my 2012 Cayenne S. However, given that my PiG is only my winter DD and dedicated boat/snowmobile tow rig, I wasn't about the drop that kind of coin on a whole new exhaust system. So I split the uprights with a set of Fabspeed secondary catbypass pipes that I installed today.

    I have to say that this relatively easy install has been a GREAT upgrade in the throatiness of the exhaust of this awesome V8 engine. I have to say that it's a huge difference as I was driving home with all the windows down and the sunroof open

Product Description

Replaces the restrictive factory catalytic converters with much less restrictive straight-through pipes for maximum flow and performance                                                             


  • Fits all Porsche 958 Cayenne S / GTS vehicles (2011+)
  • Adds 11 wheel horsepower increasing throttle response 
  • Fabspeed's Secondary Catbypass Pipes replace the restrictive factory catalytic converters with much less restrictive straight-through pipes for maximum flow and performance.
  • Direct bolt-on replacement for the heavy factory catalytic converters
  • Adds an aggressive exhaust note for exotic high-performance sound
  • Constructed from polished T304L stainless steel
  • All Fabspeed performance products are backed by the Fabspeed Lifetime Warranty


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. 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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