Nice idea, but different MAF, so the ECU would need recalibrating....if our MED9 ECUs can even read properly from those MAFs?
It's a way better airbox than the MK5 one, much bigger volume of cool air, especially when sat in traffic......where the standard one heat soaks something chronic.
I would have done it already if it wasn't for the MAF.
Battery in the boot is a pain in FWD Golfs as it doesn't have the same floor as the R32 to take a battery, although I'm sure there's a solution somewhere!