It could be a problem caused by your shiny intake pipe. Air around MAF needs to be kind of "straight", maybe by installing it sideway the airflow going through the measuring hole is messy. It usually happens when a MAF is installed very near a turbo, or inline with it, without elbows. People use a kind of air straightener, which looks like small hexagons glued together. It works. Maybe it is related to the hotpipe nearly touching the electronic compartment of your MAF and heating it a lot. You could try mounting it sideway on the other side ( eletronics near the wheel well), it should have less heat and maybe work better.
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