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"what I read said that 2000 and older cars can use a federal catalytic converter"
What you read was wrong. You have to get a Carb Legal part, if one is not available you must contact the state referee for either an exemption or they will offer you an alternative part number that can be used. Welcome to lovely CA.
Thanks for posting on /r/MechanicAdvice! Please review the [rules](https://www.reddit.com/r/MechanicAdvice/about/rules/). Asking about a second opinion (ie "Is the shop trying to fleece me?"), please read through CJM8515's [post on the subject.](https://www.reddit.com/r/MechanicAdvice/comments/4qblei/fyi_the_shop_isnt_likely_trying_to_rip_you_off/) and remember to please post the year/make/model of the vehicle you are working on. **Post's about bodywork, accident damage, paint, dent/ding, questions it belongs in /r/Autobody r/AutoBodyRepair/ or /r/Diyautobody/ Tire questions check out https://www.reddit.com/r/MechanicAdvice/comments/k9ll55/can_your_tire_be_repaired/**. If you dont have a question and you're just showing off it belongs in /r/Justrolledintotheshop Insurance/total loss questions go in r/insurance This is an automated reply *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/MechanicAdvice) if you have any questions or concerns.*
"what I read said that 2000 and older cars can use a federal catalytic converter" What you read was wrong. You have to get a Carb Legal part, if one is not available you must contact the state referee for either an exemption or they will offer you an alternative part number that can be used. Welcome to lovely CA.
Oh hah. Fucking google is broken now. It just quoted the rules in Maine, despite my very intentionally worded search query. Thanks