If I were to do my DSM again, I soooo would do the bolt on/fp race manifold route. T3 is a major pain in the ass from my experience, at least with a 1g. There are so many good bolt on turbos now days for almost everything it seems, that T3 is almost pointless unless you are shooting for 650+ HP.
I like your fp mani, 5858 (except for I only see the 5862 in a bolt on housing on their site?), etc setup. Sounds like a fun, faster spooling setup.