AlterZgo

When do you have to start smogging your car? In CA and AZ, new cars get an exemption for 6 yrs, then every 2 yrs after. For many, 6 yrs may be longer than they plan on owning the car.

Me, personally, I'd keep the stock cats on. The improvement in power is negligible w/ sport cats, and it saves a ton of hassle in having to reinstall stock cats if you keep the car for the long term. On my M3, I just flash back to stock, drive around for a few weeks to get all the smog readiness indicators set and take it for smogging, then flash back to the high HP tune afterwards. It's also good for the environment.

Tupper

4 years for me.

So in 2024

M3Inline6

For everybody flashing and re-flashing, are you doing this yourself or paying a shop to do it every time?

chong0

The M-engineering tune just requires your laptop and it's DIY.

Pad Bender

So easy to flash back to stock for emission or maintenance work.

ollies

The only problem I have experienced in the past with emissions in several states is failing for tampering. Most states have the ability to compare the vehicles current monitor status to previously run emission test results. For example, went to emissions last year and passed with all 8 monitors "passed/ready" and then return with the same VIN vehicle the following year and 7 out of 8 show ready, the other 1 shows "n/a". It can be any combination of differences of monitors, the emissions station will fail and report for tampering. Its not that they can pickup on the tune but they can flag for difference of results. With that being said, not many states testing new vehicles for 3-4 years so there likely isnt many that have dealt with this on our chassis.

M Engineering

When you use M-Tuner to flash your 992, you are provided with your tuning file(s) as well as an uninstall file to take you back to stock. When you go back to stock, we verify your CALID and CVN as stock as well so going in for an inspection is a breeze.

-Charles@M

M3Inline6

Thank you for the follow-up. I appreciate it.

RRich

What about emissions readiness monitors? On my M4 I had to verify these were complete prior to emissions testing after reflashing to a stock tune.

Tompoodie

So to clarify, what Ollies described above with a flag for "difference of results" basically can't happen because of the M engineering CALID and CVN verification??
I have a feeling a fair number of Californians on the sidelines with respect to ECU tune waiting to see larger numbers of 992 owners successfully passing California smog after re-flashing back to normal with the CALID and CVN verification for more peace of mind. "Douubting Thomases" if you will.
Thank you.

ollies

It wont happen for the reason M-Eng explained BUT also wouldnt happen due to the likeliness it hasnt been through emissions yet. What I explained would be a scenario if you had taken the car to emissions stock and then say the next year you had a tune with emissions deletes or monitor readiness differences, the emissions check would flag for a difference in monitor readiness. I plan to go with M-Eng for its ability to revert back to stock when needed, they have the ultimate product in my opinion.

Tompoodie

Thank you so much for the speedy and helpful reply, ollies.
Very reassuring. I have a 992 base on order.
I plan to tune it when it is near the end of its warranty.
It's really incredible that it will have more torque than a GTS, and meaningfully lighter weight.
It's also fortuitous that while the new PDK eight speed has gained weight, it has also gained robustness so that the increased torque of a tune should be quite safe, given the plan for the 992 to able to withstand the torque of an auxiliary electric motor in the not so distant future.
Cheers, ollie.

centaur

Congrats on the new 911 coming. Break it in and tune it. I've never seen or heard of anyone using a quality calibration from a well known reputable tuning house lunching a motor. Enjoy your 911 to the fullest and don't worship the factory warranty, tune it and enjoy the car the way it should have been delivered in the first place.
It is highly unlikely that you will actually wait 4 years if you really intend on going this route if you even own the car at that point.

BIGWORM

That's not exactly true. We have had a handful of 21/22 911's with sport cats throwing a CEL. The 2020 model years were the ones that are not affected.