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Grimspeed intake is close to stock
exhaust leaks usually cause high positive trims at low rpm/idle, that get better as rpm increases
Check you maf install into intake did you put gasket on maf ?? check for intake leaks or creased. damaged maf gasket.
carefully clean maf sensor with maf cleaner it may have oil or dirt on it
watch these videos
[ame="https://www.youtube.com/watch?v=5WnM_NsOtd8"]Secret of Engine Problem Diagnosis- Fuel Trims Pt.1 - YouTube[/ame]
[ame="https://www.youtube.com/watch?v=cARQ0jZZ4Qc"]Secret of Engine Problem Diagnosis- Fuel Trims Pt.2 - YouTube[/ame]
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