Need help to Understand Catalytic Converter Vehical Emissions Info

joefam3aj

Today I went to get my '09 Nismo smogged and it failed the visual inspection.

The only performance mods I have are the Stillen Gen 3 CAI and the Fast Intentions TXD catback with 18" resonators. I'm in CA so no test pipes, stock headers, Stock Cats are there.

The mechanic points to the Vehical Emissions Control Info sticker (see attached image) under the hood and points to the "2 TWC(2)" and says that I've failed the inspection because the label denotes that there should be 4 cats on the car, but the exhaust mod has removed two and he only sees 2.

I got kind of mad at him and tried to explain that no, the exhaust is a catback and there are only two cats on the car stock, but he just kept pointing to the sticker and saying how the (2) meant that there were 4 cats.

Can anyone help me understand what the (2) in "TWC(2)" means and/or point me towards some documentation that would help me prove to this guy that the 370z only comes with 2 cats. I've been searching online all night and haven't come up with anything I can take back to them.

Thanks.

Attached Images

20150915_234329.jpg (568.0 KB, 38 views)

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2009 Nismo: Stillen Gen3 CAI | Fast Intentions 18" Res CF CBE