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More then likely the loud exhaust is causing the knock sensor to act up. Sometimes loud noises can cause knock sensors to go crazy. Also the EGR code could have something to do with your emissions system. Seeing as your in Cali I would have it checke dout since you guys have smog. I no longer have emissions on my car as in Chicago 95 and older dont get tested so I yanked all my stuff off. Never gave me a code though, but im OBDI, wat about you?
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