if you go bigger injectors you will need a 3" MAF and a map to suit. You won't need it unless you're going bigger than a K03s though
As for coil packs you are probably entitled to a new set from VW, it's worth phoning your local dealers and asking. You can always change to the TFSI coilpacks, it would just mean you need to shell out for a set and also a set of spacers
