the opening is bigger, so your stock intake tube probably won't fit it.
lower intake is most restrictive (replace the upper at the same time), then the mass air meter housing, then the heads. after those are opened up, then the t/b might make a difference. until then, you are not likely to see much difference.
my 70mm BBK t/b is going on in the next few days.
fwiw, i have my stock mass air meter back on for a few weeks until i can get the injector slopes dialed in, i just replaced my fuel pressure regulator.
my $.02