What we've been planning on the rally VX is smaller dual turbos feeding an intercooler mounted on top of the engine and fed by a low-profile hood scoop. The intercooler would be about 6 square feet and of a dual-inlet single outlet design, which are common in a variety of sizes. This keeps plumbing short, simple and efficient. Planned engine management is Megasquirt since it's supported, open source and uses no exotic components.