i had the filter out to clean it and while i let it dry i took the car for a drive to get some lunch.
a few times i gave it some stick and i noticed the rev limiter didnt kick in until 5500rpm

and then when the filter was put back in it felt a litttle underpowered

now im wondering if the computer reprogrammed itself to work without the filter and with the extra airflow?
is this normal for GU petrols?