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The Z1 High Flow Catalytic Converters are fully constructed of Stainless Steel. Using a 100 cpsi Stainless steel spiral wound core, they are the highest flowing bolt on converter available that is OBDII compliant.  The Stainless Steel cores are high heat resistant and offer excellent flow characteristics. The Z1 High Flow Catalytic Converters are a great upgrade while keeping your car "49 State Street Legal". 

Take advantage of freeing up your exhaust while not picking up the "Rasp" commonly associated with test pipes when used on the "HR" and "VHR" engine platforms.  

Often the RTV sealing method or composite gasket for the 3 bolt flange from the manifold to the test pipe doesn't hold up over time due to extreme exhaust temperatures and can fail leading to irritating exhaust leaks and potential Check Engine Lights.  To solve this potential problem Z1 has designed and produced our very own multilayer metal exhaust gasket for this application.  This gasket is similar in construction to the manifold to turbo gaskets we have used for years on turbo applications.  It has proven to be one of the strongest and most robust parts on any car we have used them on; these gaskets can be removed and reinstalled countless times without any problems.  Now we include them in our kits, and make them available separately here. 

Each order includes: on pair of High flow cats, one pair of Metal multilayer 2.5 inch 3 bolt gaskets, and one pair of composite 2.5 inch 2 bolt gaskets, and all necessary hardware.

Z1 Motorsports cannot guarantee that any of the different brands of high flow catalytic converters we sell, including our own, will not cause a CEL (check engine light). From our experience it is not a problem on 90% of cars.


One roll of Z1 Heat Wrap can be included at a discount rate using the options below. Z1 Exhaust Wrap is ideal for wrapping test pipes, high flow cats, or any other radiant heat sources under hood or under the car. Includes 4 14'' stainless steel ties.

Available Options:


*** This item does not qualify for any additional discounts or promotions ***


What our customers say...

Gave these hell for almost 2 years, no issues with hfc or gaskets. Highly recommended. ...

Rated by Verified Customer Purchase Read More

These will free up a little power (better with a tune), lose some weight, and add a little volume to ...

Rated by Verified Customer Purchase Read More

Bought them for my 08 G37. Perfect fit. No CEL. Sounds great even after almost a year of use. ...

Rated by Verified Customer Purchase Read More

Questions our customers have asked...

At some point of time I am going to purchase an exhaust system, and with that system I am going to buy a set of Cats for my 370z. I was wondering if these Cats are compatible with the Tomei expreme TI cat back exhaust system.

Response: Yes they are compatible with the Tomei Cat Back.

Are these legal in California? Been looking for aftermarket CC for my Z and majority seems to be illegal here!

Response: We have not submitted our High Flow catalytic converters for CARB approval/exemption. Sorry ours are not legal for street use in the republic of California.

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