I've replaced my maf 3 times with genuine ones from tps and it's still the same, yeah that's the same as me, but the past day or to its been fine, my mates agu pisses mine, his has no record of any tuning, we both done exhaust and fordge recirculation valve, other than that there both standard, when he boots his it'll wheel spin in the dry all through first and second,,mine will only spin in first in the wet, I've never been in another 1.8t apart from that's there both standard with the same sorts miles, I've never been in another 1.8t part from his so I don't know if mines under performing or if his has been chipped