Hi looking at fitting a bigger Maf to my EF. How much bigger is the AU Maf?
I am also wondering about just boring out the EF Maf on the lathe at work any suggestions as to how much bigger to go.
Regards
Fitter

Increasing the size of the MAF is not a good idea. Your air fuel ratios will be thrown out and if it leans out too much you can get detonation and a wrecked engine.

A bigger MAF is only a good idea if you've got other mods to support it and you get a custom tune or sample insert for the correct size injector you have. 19lbs I assume if your car is stock.