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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".

Each set includes:

  • (1) Set of Z1 VQ35DE High Flow Catalytic Converters 
  • (10) Bolts, Nuts amd Washers
  • (2) 2 Bolt Rear Exhaust Gaskets

Z1 recommends reusing the factory 3 Bolt Header Gasket or purchase new HERE.  

Unlike many of our competitors, our cats just like our test pipes will bolt on easier with 2 factory style studs used in each of the top flanges rather than just nuts and bolts, making install a breeze.

Fit '03-06 350Z, '03-06 G35 Sedan, '03-07 G35 Coupe models equipped with the VQ35DE (Single Throttle Body) engine.

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.

Z1 also offers full flowing test pipes for customers looking to maximize their power output, available HERE.

Available Options:


$424.00 $374.00

What our customers say...

The fit on these is perfect and thus far no cel without a tune. ...

Rated by Verified Customer Purchase Read More

These HFC make a notable difference away from my stock cats. Sound and Performance, slight more deep tone on start ...

Rated by Verified Customer Purchase Read More

I'm not sure what else to say about these other than they are the greatest damn HFCs ever, absolutely no ...

Rated by Verified Customer Purchase Read More

I bought these to replace the Manzo Test Pipes, because I got tired of such a strong exhaust odor. They ...

Rated by Verified Customer Purchase Read More