Just to add to what one on the other lads said earlier.
A freind of mine own a rotary workshop....
Last year he did a turbo conversion for a keen drag racer..
Guy swapped from a typical t04 style turbo to a 42r.. Witch is a freakin big turbo...
Guy was amazed.... made tones more power and even spooled heaps earlier.
Please note... I am in no way rocomending you run a 13b with a 42r in a street 86... Unless ofcorse you have suicidal tendensies.