Porsche 911 Carrera European Pre-Muffler Cat Bypass Pipe

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Replaces factory catalytic converters with a straight-thru resonated European design for increased flow, resulting in more horsepower and improved throttle response                                                                           


  • Fits all Porsche 911 SC and Carrera vehicles (1976-1989)

  • Adds 16+ whp / 15+ tq and significantly increases throttle response while saving 8 pounds

  • Improved sports car sound- gutsy european pre-muffler style. 

  • Constructed from 14-16 gauge, T304 C.N.C. mandrel bent stainless steel.

  • Includes straight-through resonator with stainless steel wool packing to last. 

  • Includes O2 sensor bung so the fuel injection system can automatically adjust mixture/idle/part throttle for maximum performance.

  • Simple DIY bolt on installation

  • Simple reversible direct replacement bolt-on for the stock ancient restrictive cat. 

  • 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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  • 5
    Perfect fit, improved performance

    Posted by Michael Hackney on 27th Jun 2018

    Firstly, the product is well designed and manufactured. It literally bolted into place on my 83 Porsche 911 as if it was OEM. But the best part is, my gas mileage improved by almost 2MPH and I feel a bit more power. I don't hesitate to recommend FabSpeed!

  • 5
    Perfect fit on a 1977 Carrera 3.0 (Euro)!

    Posted by Anonymus on 13th Oct 2016

    Very nice product, solid workmanship, perfect fit and noticeable performance improvement. Totally recommend this product!

  • 5
    A performance boost with enough "growl" to get you some attention...

    Posted by Fred White on 24th Aug 2016

    I installed both the Euro cat bypass and muffler bypass on my 1987 Porsche Carrera. As a retired engineer I am probably overly "picky", but the quality of construction is evident from the moment you open the box. The installation went perfectly with the exception of having to slightly enlarge the gasket holes (not made by Fabspeed) and the results were wonderful. I am running this with a Steve Wong chip, and he has a Dyno chart for a similar setup on his website, claiming 246 hp at he flywheel. My 0-60 times have definitely improved. I would recommend this to anyone desiring better sound and more power from one of our beloved "airheads".

  • 5
    Best quality and best exhaust! Hands-down.

    Posted by Gabe Ramirez on 11th May 2016

    I also have Fabspeed mufflers on my 996 and recently ordered the Maxflo muffler and euro catbypass pipe for an 89 3.2 Porsche 911. What can I say but "beautiful exhaust notes"... Quality is best in the industry and it's money well spent!!!! I will keep buying Fabspeed products for life!

  • 5
    Nice product

    Posted by Mike on 5th Sep 2015

    All parts (bolts, nuts, gaskets) included. After cursing heavily during factory cat converter removal, you will want to use anti-seize on the bots/nuts. I combined this with a upgraded Steve Wong DME chip install and the combination provides a noticeable mid-range RPM power/torque boost between 3000-4500 RPM. Very well made piece and deepens the exhaust note with the factory muffler without drone. Overall very satisfied!

  • 5
    quality superb

    Posted by Anonymus on 11th Jul 2014

    Like a other review I had a problem. The hardest part of the installation was wrenching it out of my sons' grip, By the time I removed the old cat he had it mounted on his wall. After hours of pleading he relented and the installation went without a hitch, With stock muffler it has given the car a nice deep tone.

  • 5
    911 SC Catbypass

    Posted by Bob K. on 12th Mar 2014

    I am very upset about the recent purchase of a Fabspeed pre-muffler/cat-bypass pipe. First, and foremost, I was expecting $300 worth of quality and I received $600. I was also expecting a wrestling match with the install and it fit perfectly. The high quality fasteners and copper gaskets were really, really annoying . I will bet that little Fabspeed nameplate is stainless too. Oh, let's talk about weld quality. What's up with no spatter and the beautiful uniform beads? The flanges are disgustingly stout and the overall finish is astounding. As to performance, the 81 SC only sounds better, revs quicker and has more pull. In short, I was hoping for a whole lot less. When I scrounge up the cash for my next Fabspeed product, I hope you do a better job of meeting my expectations.