AGU and vr6 sensor are the same, you can use either without issue.
For an AUQ, as above, larger maf housing from any ko4 based car, so LCR, S3, TT225.
Larger injectors from same.
Although, if you're on the stock ko3S, you don't need either, and do not stand to gain anything at all.
The most powerful ko3S I've ever known of was an AUQ with stock MAF and injectors.
It's only the AGU that needs these at 230, as it's MAF maxxes out much lower than an AUQ, and it was smaller injectors too.