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Message: <blockquote data-quote="Superstroke17" data-source="post: 1036752" data-attributes="member: 17351">It knocks when going from 5 or 6 (it was here when i got the car which means someone knows this already and bumped it down for a reason)up to 10. It won't run at 10 without spark knocking at about 3K rpms.Also:Filter didn't help much. Codes didn't show anything but for thermactor system where smog was removed. I've got to try to find the right adapter so i can check my fuel pressure. Balance test came back good also. Wondering if my o2 sensors are bad, it should be getting a lean code i would think. Also it seems to run worse when it's cold? Maybe iat sensor? I have also noticed an exhaust leak around the collector area now that i can hear it after having tailpipes put back on. Don't know if it would affect anything?</blockquote>