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All depends on the county I just my Manuel but pretty much obd2 is usually a visual a gas cap check and depending on the county they either check for codes or do a dyno test. But if your not throwing a cel and you take it to someone who is not super strict they may not notice it missing or care that it's missing. But you could fail in which case go home put the stock dp back on take it back and you do not have to pay for it to be inspected then after put the catless do back on
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