The interesting suggestion from Kyle at 6 boost which is at the heart of this build, is the manifold/turbo choice. It's an attempt at the eternal power/response equation. The way it's going that is well underway is, split pulse manifold, twin waste-gates, twin scroll turbo in GT35 size. Speaking to Kyle today, the manifold is built, and the turbo is on the way from the USA. The hope is that the twin scroll will give 500rpm of earlier spool, as will the vct, if all else fails I'll make up for loss of spool using the converter.