I am going thru the specifying phase right now on a pair of billet turbo's for my 555. Since its only a street car I know the compressor side. 72mm. Plenty of power available from twin 72's.
But there is still some thought being put into the turbine side as to the best size. 83mm or 87mm in a 1.3 A/R stainless housing that uses a V-band mount.
And the primary pipe on the turbo headers will only be 2". On a N/A motor, a 555 would be at least 2.250. So big difference there.
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