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Fabspeed Shelby GT350 / GT350R RENNKRAFT™ Modular Sport Catalytic Converters (2016-2020)

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Fabspeed Shelby GT350 / GT350R RENNKRAFT™ Modular Sport Catalytic Converters (2016-2020)


These modular Shelby GT350/GT350R RENNKRAFT™ Sport Catalytic Converters are the perfect solution for any street and track focused GT350/GT350R owner. Adding significant power and sound, you have the option to go with ultra high-performance HJS German Imported HD Catalysts or our modular design featuring a quick release V-band connector allows the owner to easily swap between our German made HJS 200 cell cats and a cat bypass “straight pipes” for all out competition race track use. RENNKRAFT™, translated from German is “race power”. These unique Sport Catalytic converters offer true street and racetrack functionality in an innovative precision engineered package. 


There isn’t much to improve on the intoxicating sound of the flat plane crank 5.2 liter V8 - until now. Adding a significant increase in power, tone, and sound, these high flowing RENNKRAFT™ Sport Catalytic Converters give unrestricted flow with NO CEL (Check Engine Light). Equipped with our 200 cell cats, you will get a more aggressive and raw exhaust note. Higher frequency tones are more defined, and deceleration burbles are more robust and transparent. The volume isn’t overbearing, but the sound is very aggressive on WOT (Wide Open Throttle). With the stock muffler in place, there is no drone what-so-ever.


After extensive dyno development we found that using the highest quality HJS German Catalysts offer the most power across the entire power band. With no tune, compared to a stock car we gained 21 whp and 27 ft/lbs of TQ at 7100 RPM with Sport Cats. That’s a gain of 25 HP at the crank! See our untouched dyno graph above for more details.


  • Fits all Ford Shelby GT350/GT350R vehicles (2016-2020)
  • Impressive dyno proven power gains of 21 whp and 27 ft/lbs of TQ with the Sport Cats
  • The HJS Catalytic Converters will support 1200HP+
  • Includes Cat-Bypass Pipes for off-road and track days ONLY
  • Modular design that uses a V-band clamp so one can quickly swap between cats and cat bypass
  • Switching to cat-bypass for track events prevents catalytic converter degradation during all out competition racing abuse
  • Designed from 3D scans using our Creaform Handyscan 700 and CAD designed so we can achieve perfect bolt-on fitment
  • German-made HJS HD tri-metallic 200-cell EURO 6 homologated catalytic converters for best performance and reliability - the largest catalytic converters that will fit in the factory location for maximum flow
  • Fabspeed is the exclusive North American & South American importer and distributor for HJS Emissions Technology with HJS warranty
  • Sport Cat variation will flows 90%-93% of a straight pipe
  • Will NOT cause a CEL (Check engine light), NO P420 or P430 codes, when Sport Cats are installed
  • No ECU tune required
  • NOT EPA or CARB Certified and not be used on street driven vehicles
  • Constructed from CNC mandrel-bent T304L stainless steel
  • Simple DIY (Do-It-Yourself) bolt-on installation, no cutting or welding required
  • All Fabspeed performance products are backed by the Fabspeed Lifetime Warranty

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.    If you'd like to learn more, watch our video about HJS catalytic converters.

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.

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.


We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.