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Old 01-31-2022, 04:57 AM   #1
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Default Project Headers and Exhaust System

New project now retrofitting and upgrading my "1987 Nissan Pathfinder SE 3.0 4X4 VG30I" from basic model looking for advise for installing;

1. Headers; long on either the Cat system or Y exhaust pipes?

* NOTES: I'm not really interested in how loud after converting but rather increasing the HP power and freedom from the manifold?!

NO CAT will be installed, legally, so hit me up with your comments and own experiences.

Happy off-roading
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Old 01-31-2022, 05:54 PM   #2
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Use long tubes for the VG30e. The Y pipe will likely have to be widened. I have a thread on headers on the VG30i.



You will need to go to a single at the O2 sensor then you can go back to duals if you want.
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Old 01-31-2022, 08:15 PM   #3
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Welcome to the site. Comifornia will hit you for the no cat.
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Old 02-01-2022, 01:11 AM   #4
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Welcome to IN...

Doesn't Cali still have emission testing? I don't know if this will fly with them...


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Originally Posted by Deerhurst
What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.
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Old 02-01-2022, 01:57 AM   #5
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I deleted the other thread.
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Old 02-01-2022, 07:45 PM   #6
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YES, Cali has their emission's laws so now installing legal CAT along with upgraded exhaust and headers and planning a relocation the f &*$ out this State like others by the thousands!

Thanks for all your advise and reply's!

Tommy Vee
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Old 02-01-2022, 08:21 PM   #7
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Even though you have a cat, there is a limit to what you can do and still be legal.

Any changes before the cat will have to be CARB legal....like ur headers.

I THINK, as in not sure, that after the cat you can do most anything.
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Old 02-01-2022, 09:02 PM   #8
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As an ex Californian I ask that where you move to do everything in your power to NOT let it turn into California. I see too many leave Cali to move elsewhere and turn it right back into Cali. Portland is a perfect example. OR is turning into California V2.0. It sucks.



A cat is a federal thing. If you truck is originally a Cali rig it will have a couple other emissions controls those for all other states lack.
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Old 02-02-2022, 01:51 AM   #9
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To legally pass a CA smog test. Any part like headers, will require to have an EO(Executive Order) number either stamped on the part(s) or in the documents the parts came with. Without an EO, you will fail a legal smog test right at the start of the test when the technician does the visual inspection.

You should check the CARB (California Air Resources Board) website for EO numbers for your model vehicle. They provide a list of manufacturers that sell emissions parts that are legal in CA. That’s what I did when the muffler shop I use wanted to sell me my CAT. I looked it up first. My CAT EO number matched the 2.4L engine for the 240SX model, which uses the same engine. So it was good to go. Even buying headers in CA is a tall order. If an emissions part is sold in CA. It’s smog legal.
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