So what's a prv delete and whats a IDC free play kit I have seen posted on here for sale
The PPRV delete as posted above is the parallel pressure relief valve.
People delete it when attempting to eliminated the "shift hez" or shift hesitation.
A better solution is to get a top quality tune and never get the shift hesitation with elevated boost in he first place. It can be eliminated with a correct tune.
I never had the shift hez, but deleted it anyway because I was in there and was looking at it and decided that is was a significant restriction.
My understanding is deleting it can help reduce fuel pump duty cycle due to the lesser amount of restriction in the flow path.