I am in the market for a big turbo but I would like some input from you guys running the t4 60-1 or other big t4 turbos.

I would like to know how well they spool for you guys. About what rpm does boost start to come in and what size Housing do you run. Two of the turbos I am considering now are the t3/t4 60trim and the pt54.. Now I can get the pt54 with a t4 or t3 turbine. the t4 is the split flange design. Any input would be appreciated.