First, leave the mindset of how you mod your WS6 V8 Trans Am when modding your GTI because it's completely different like there are no aftermarket cams for this platform. By the way, I love TA's! My first car was a '88 GTA in black with a LS motor swap and 4.11 posi rear and it was a blast to drive. Anyways, not to discourage you but I hope you have some deep pockets because it will cost you tens of thousands for everything to mod this platform for drag racing. A complete built block with cylinder head can range from $8K - $12K depending on the parts you get and the shops labor. I've been building mine for drag racing and you can take a look at the list of parts that I already have in my build thread for reference and it's a long list.
https://www.golfmk7.com/forums/inde...s-2016-gti-s-build-a-k-a-jersey-devil.378424/
For upgraded turbo, I highly suggest skipping a hybrid and going with a full frame turbo which you can get a kit from DBV2. I ended up getting his G30-900 turbo kit, which I have yet to install but I'm working on that. Another word of advice, stay away from any kits that utilize the OEM electronic wastegate actuator because that damn thing fails all the time! I am on my 4th one with my current hybrid turbo so don't believe any of those vendors that want to say it's a great wastegate because they are only trying to make money off of it. It sucks and always has issues!
https://www.dbv2.com/collections/volkswagen?page=3