Thanks Andrew, if I need it I will be in touch, looking good for now.

Thanks Mao, I put the OEM filter back in, big difference, very very minor stutter, hardly noticeable (I guess the ECU needs to adjust again?), fresh tank of BP98 too while I was at it (filled from quarter up if thats any help).

Dad hinted at the sparkplugs, maybe they need changing (car is due for a 77,500 km service soon, it is currently at 74.5 but I may take it in earlier and get the service done with new plugs + coils if neccessary).

Checked the vaccum lines, everything is secure and where it should be.

Thanks guys, I'll see how we go over the next few days.
-Shane.

PS: Mao I wish it was a worn turbine would be a good excuse for that TD05-20G upgrade haha.