My 2 cents and yes my turbo motor is way milder than yours and will be less powerful by about half and isn't running yet. If there is room you should consider going to a 4" downpipe. Everything I've read and everyone I've talked to says downpipe diameter has a measurable effect on spool. I'm going to use a 3.5" downpipe with my 62-1, which was recommended by the guys at turbotechnology in tacoma. A 78mm turbo is no joke. It wants to breath.
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"The first rule of overkill: You can never have too much overkill."
"Overkill is underrated."