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Mofo
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2,225 Posts
Any header for any Nissan motor is NOT C.A.R.B legal. You will fail the visual test, o2 sensor or not. What you can do is a cat back. I had the Hotshot header, and the stromung exhaust on my sentra. Each time I had to smog, I had to replace the header with the stock manifold to pass.
If you go with the stromung cat-back, get the correct model for your car. They will ask you all they need to know.
Leagally you can modify the intake, and anything behind the cat. But some places are anal about the intakes, and will fail you on the visual test.
 
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