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Message: <blockquote data-quote="96blak54" data-source="post: 1470993" data-attributes="member: 14727">Honestly tho, i couldnt see a boosted intake of any type being a restriction at such low rpm. But high enough rpm for valve spring problems under boost.Another thought and would be a cheap process, the lashers probably need to be bled out. They hold old oil, changing their character. Take'em out, heat them up, and squeeze work them clean. Do a good synthetic 5w-20 oil change while youre at.My initial thought to this response is, valves are hanging open. Common problem with boost pressing on the valve, essentially reducing seating pressures.</blockquote>