California emissions questions
 

Hello!
I was wondering what would make me fail a smog check in California. For my car I would like to swap out my headers for uel headers most likely by Rev works and then also swap out my front pipe for a high flow catted option. I was told by someone that even with a cat on the front pipe I could still fail smog. Is this true for catless headers as well? Ideally I will change out my headers front pipe and over pipe. Is this just a pipe dream (lol) or in theory could I still pass smog?
Cheers!

removing the primary cat (changing headers) will fail you right away

best bet is to keep your oem parts and re install them before you get a smog

and that's after like 5 years right? or 6?

Yea that's prolly the most realistic way of handling this. And as far as the headers go, lol at your insta fail comment. I figured that's how it would work haha thanks

Unless someone makes a header with a heat shield that looks OEM, then we're all kinda SOL in terms of smog check. Swapping back to stock is really the only option at this point.


Sent from my iPhone using Tapatalk

Forgive me but what would the oem style heat shield accomplish?

PASS visual inspection

would any of the popular exhausts (perrin resonated catback or milltek catback) fail a smog check? i guess i don't have much to worry since the car is new, but just curious.

By definition catback should never fail anything since it's from the catalytic converter back. But I guess it's not impossible

Anything catback is legal as long as its under 95 decibels.


Sent from my iPhone using Tapatalk

Like @86_ZN6 said, it will pass visual inspection. I don't know if it would pass the tailpipe test.


Sent from my iPhone using Tapatalk

While I have the attention of people more mod savvy than I, are their any associated possible long term health issues that could arise from not having a heat shield? I mean for the engine I guess

A long the same lines of questioning....

Would bigger injectors (for E85 or FI) and a tune be a problem for smog check (assuming no E85 or FI is installed on the car during smog testing, and assuming all emissions equipment is intact)?

Basically what I am getting at is do the injectors need to be swapped back to stock for smog because that would be a major PITA.

No. Ceramic coated headers are actually better than a heat shield anyways.


Sent from my iPhone using Tapatalk

For E85: if you're NA with all emissions equipment you'll be fine.

For FI: I'm not sure, because if you swapped everything back to stock except the injectors wouldn't it run too rich? That's my guess. Visual inspection you'll pass. I'm not sure if you'd pass the tailpipe test. I've never gotten that far into the mod process on a car.


Sent from my iPhone using Tapatalk