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to my knowledge here in the dfw are at least the newer cars that are obdII they just plug into it at the obd port i have not seen them put the sniffer in the newer vehicles and on my trucks that are newer all they have done is plug into the port
but like on my 89 the put the sniffer in the exhaust but i have no trouble passing i have a ls1 in it with long tubes and highflow cats and have not had a single issue
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