not using the butterflies.
The manifold was made by Jeff White, it was all taken apart, including the end of the plenum, with the butterflies removed and the whole thing was ported.
The second set is going to be activated around 10psi by my megasquirt. so i will only have 450's running while cruising around town.
Last year I tried running all of them all the time but had idle problems. I will see if that is fixed this year.