I think you are confused.. he is talking about the COLD pipe coming from the stock cooler, it has his Blitz BOV attached to it. THIS pipe will be replaced by the piping in the kit, he is asking if he should try put his Blitz BOV in the same spot that it currently is or put it on the crossover pipe where the stock BOV sits.
I've seen adaptors for RB20/25's are my local Malz (our version of Autobarn), bolts in the stock location and has a 90deg bend in it. My R2D2 was actually mounted inside the front right guard.. well out of the way of prying police eyes