on new cars 1996 and newer you could use 02 foolers or find and friend in the smog check biz...now the bad if your car is 1995 or older the have to do what they call a sniffer the put this tube in your tail pipe and it meters the smog coming out the only way to pass that is to put your smog parts back on for the test or find some one that wants a few extra $$ and presto the can pass the car.on a side not i do not stand behind the GOV on smog equipment the cars would run so much better with out it and mpg would go up
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