Hondata and VAFC are not even in the same league. The VAFC lets you adjust the cam crossover and add/subtract fuel at 500 rpm increments. The Hondata does that and a whole lot more (timing, larger injector compensation, drag launch, full throttle shift, etc.).

If you've got basic mods (i/h/e), a VAFC will do just fine. But if you have big cams, boost, or extensive engine work ... a Hondata (or other stand alone ECU) is the engine management you need.

From what I've read, the Spoon TB is not 70mm straight through. The opening is 70mm and it tapers to the stock ITR TB size (62mm ... I think). Someone else may be able to confirm this. HTH.