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I live in cali and heard the same thing. I decided to take the risk and ran o/r pipes... No sniffer caught me for a few months and ive never heard a true story about them. I know they have the "power" to pull you over on suspicion of a gross poluter and check but i don't really know.
i do get alot of poping noise when i decel... i actuly like the sound, could anything bad come of it? i got straight pipe 2 and a half inch, if i went to 3 inch, would it be any deeper or louder?</P>