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Discussion Starter #1
1999 LS Auto 144k - Bought in East Coast - so it was not a California car.
The Car is in California - Fed compliant CATs are not compliant in CA!

2021 Results compared with others:
Test MAX AVE 21-MEAS 19-Retest 2019 2017 2015 2013 2011
15mph 467 67 357 146 693 462 445 442 246
25mph 754 62 1079 646 8 34 44 78 72

1) RockAuto has several products from $100 to $500! Most do not fit CA or my LS!
I do not know which one is direct replacement - meaning no welding needed?
Pls recommend.

2) Does my car being Auto is another thing to consider when purchasing one?
Meaning stick shift vs Auto means different CAT model?

3) Last time, in 2019, it failed at 15 mph
I changed the Air Filter, Oil, and used the CatClean - it then marginally passed with slightly higher value for NO at 25mph. Wondering if CatClean damages the CAT?
If you see the table above, NO at 25mph jumped from 78 to 646 after using CatClean! Or is this expected to be random when CAT fails?

Please help me to find a direct fit that works in CA? Thanks
 

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Discussion Starter #3
When I look at Rock Auto, there are actually a lot of converters that are CARB compliant (California Air Resource Board). Additionally, all of them have the factory mounting flanges to mount to an OEM exhaust design. For instance, the Walker 81781 would work for your vehicle.
$538.79 + Tax
Is ACURA part is cheaper?
 

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Discussion Starter #5
How many holes are there on the CAT for O2 sensor?
What is the "Outlet Diameter"? 2 or 2.25"?
Thank you
 

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Discussion Starter #7
You have the model number already. Go on the manufacture's website and look.
18160-P75-A61

I called the dealership and they could not answer it! They said I buy and measure it - but its discontinues.
Online search bring too many parts and confusing.

Maybe I found it here - but O2 sensor?:
 
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