Keep digging. Don't by a BOV, diverter spacer, etc. Also, think good and hard about getting an intake. The stock intake flows well with some basic mods.
Outside of that, most of the threads here are awesome. Make sure to look at both the GTI and R specific forums. They share a motor with slight differences in build and quality. But mainly the turbo.
Welcome and sorry you found this forum, your pocket book will not be the same. But.in a good way. There should be optional loan financing options for mods due to how well these cars take to them.
Wasn’t planning on bov or spacer. I’m planning on drop in filter, inlet hose, and maybe an elbow. I’m saving up for suspension, wheels and tires first.