I got my 98 Z28 w/ SLP Loudmouth exhaust inspected back in July at the Kilmer inspection station and it passed without any hassle. Granted I haven't messed with the cat converters, but it's still loud. I've failed in past years for the loudness, but I passed for the first time this year at a public inspection station since they did away with the visual inspection and only do the smog test. It's awesome because now I don't have to shell out more money to get it privately inspected anymore.
I agree with the other person about them revving the engine. I kind of hate when inspection workers do that.
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