Fabspeed Porsche 718 Boxster / Cayman Sport Cat with Downpipe (2017+)



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.    

The Fabspeed Sport Cat with Downpipe is a great bolt-on modification for any 718 Turbo car. These Sport Cat with Downpipes feature German made HJS 200 cell EURO 6 EC certified compliant trimetallic catalytic converters. We use all mandrel bent T304L stainless steel 3 inch tubing that splits into 2 inch tubing from the cat to the rest of the exhaust. The cats are the largest and highest flowing catalytic converters you can fit on the 718. Larger catalytic converters are better because they allow for more exhaust flow and the increased catalysts surface area allows for better exhaust gas filtering which means emissions compliance and will NOT trigger a check engine light. Our Sport Cat Downpipes are a direct bolt-on replacement for the factory 718 catalytic converter and downpipe. 

SOUND: The Sport Cat with Downpipe adds more volume to the characteristic boxer engine rumble. No droning, and the activation of Sport mode greatly increases cracks and pops during shifting and overrun conditions. Expect a slight increase in turbo sound as well - which can be enhanced even further at any point with the separate addition of our Maxflo Exhaust System.

POWER: Fabspeed's Sport Cat with Downpipe will add an estimated 20 whp. You can extract  even more power with our hardware in conjunction with a Fabspeed ECU Tune.

FINISH: T304L stainless steel, beautifully welded together and finished off with hand made single-wall stainless steel tips or premium matte carbon fiber shrouded tips. 

Why We Choose HJS Catalytic Converters:

HJS German imported catalytic substrate cores are made by EMITEC utilizing the highest grade stainless steel materials and Tri-metallic precious metal wash coats for high performance street and racing competition usage. HJS German 200 cell Trimetallic Euro 6 HE catalytic converters give the highest performance gains, improved sports car sound and maximum durability. Other brands of catalytic converters immediately deteriorate and fail over time as is typical. Some other companies and brands DO NOT even offer catalytic converters as they know that their catalytic converters will NOT work even when 100% brand new as they have no reliable quality solutions. The HJS German imported HD catalytic converters flow up to 90-92% 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. Typically no P420 and no P430 codes and your car smells clean with no need for a tune to pass emissions testing. It’s a win win solution for a sportier sound, more power, and a cleaner running car which prevents pollution. Not all HJS catalytic converters are the same. Size matters and directly correlated to power, sound, and durability. Fabspeed utilizes the LARGEST possible HJS Catalytic converter for maximum power and sports car sound.  No short cuts ever. 


  • Fits all Porsche 718 Boxster/Cayman Base/S Models (2017+)

  • Improves power, sound, and throttle response by decreasing back pressure and increasing exhaust flow

  • Simple bolt-on installation. Instructions included below

  • The largest HJS German imported EURO 6 homolgated tri-metallic catalytic converter  that will fit in the factory location

  • Designed to fit Left hand drive and Right hand drive cars worldwide

  • Significant performance gains across the RPM band. Estimated +20HP gained over the factory unit

  • Even more power can be unleashed with a ECU tune.

  • No check engine light, no tune required. TUV certified OEM type ultra quality catalytic converter. 

  • Superior quality all German and USA components built in house by hand

  • TIG welded by our expert welders

  • NOT CARB certified NOT EPA approved. 

  • 3 inch 76mm tubing for maximum flow into Dual 2 inch T304L stainless steel construction

  • Fabspeed performance products are backed by Fabspeed's 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. 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.