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I have the K&N tube only with a carb sticker and they checked mine. Ran the number and everything. They go with a flashlight and check the entire engine, look under the car. I think the tech even has a photo of the stock engine for comparison. More than I remember them doing in the past.
Also if you have a range device, make sure to unplug it and drive at least 200 miles on it. Unplugging the range device right when you get there leaves three of the sensors uncheckable. I was warned once and told that if they couldn't be read after driving so many miles and cycles I wouldn't pass smog.
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