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Message: <blockquote data-quote="Daryl" data-source="post: 1586642" data-attributes="member: 24538">I can’t say for certain if clamp-on cats are acceptable or not, but I’ve never had a smog shop look under the car or put it up on a lift to inspect. They basically just start the car, place the probe in the exhaust pipe and run the test.Try Googling “are clamp-on catalytic converters legal in CA” and see for sure. Good peace of mindon edit: I just Googled it and clamp-ons are NOT legal in CA. But again, I’ve never seen any smog place look, so you could roll in with clamp-ons for a smog check and if they notice play dumb, just roll back out, go get them welded in, get rechecked and call it done! I’m sure there’s a ton of weld shops near smog shops in the Chula Vista area that are on a walk-in basis ;-)</blockquote>