My 2006 honda civic's catalytic converter got clogged up and need to be replaced along with the O2 sensors. One shop estimated that it'll cost me around $1400 to repair this. $780 for the new cat converter from Honda, $150 for the upstream O2 sensor, $130 for the downstream O2 sensor and $350 for labor.
What i'm wondering is if theres any other cheaper alternatives to buying the converter from honda. I can't seem to find any because all the ones that fit my car are only legal in 49 states and I live in California ):.

The car has really slow acceleration and I was told not to drive the car or risk engine damage. I wanna get this problem fixed soon. Any advice is appreciated and welcomed!

Could I use a used cat converter from another 06 civic? Like from civics that are parted out.

 

$1,400 is steep. If you're mechanically inclined you can save yourself some money by doing the job yourself. There's non-Honda parts out there for a fraction of the cost with the same functionality. I did a quick search for a 2006 cat and found this:

http://www.1aauto.com/1A/direct-fit-...FUKd4Aod3hsAZA

It's approved for use in California and is less than half the cost of the OEM part.

 

Product details says it not CARB approved ):

 

My bad, I read it wrong.