A few questions regarding those measurements if you don't mind?
Just because two housings have the same A/R, it's entirely possible that they are completely different in design is it not? A/R is just a ratio of area of the scroll to the distance from the shaft, and speaks nothing of actual design?
Also with wheel measurements, what does "1.997" mean? Can you have two different compressor wheels in DESIGN, but still have the same measurement of 1.997 inducer and 2.773 exducer?
One last thing, apparently the GT-RS compressor housing has a new "ported shroud" design to try and reduce surging, so surely it's not the same as the GT2835?
Cheers,
Andrew.