I've seen a few GT4 Evoras close-up in the Dubai 24 hr pits. A few observations :
The Cosworth built 4.0 uses a completely different intake plenum with single TB - long runners, large capacity, carbon fibre... I assume its got X6 long air trumpets inside the moulding. Its way bigger than the SC, and pretty much fills the engine bay above the cylinder heads.
The 4.0 had a completely different exhaust system made by Simpson. The manifolds were very long runs, no cats, heat coated & after the Y connector, the silencer was a single, side outlet. This mean the rear diffuser was different too.
The above exhaust was only compatible with the race gearbox (Xtrac?)
I think the list could get a lot longer... but I dont think this would be an easy swop. Lotus MS built the GT4's to go racing, when you get into the details, many components were charged Vs the road cars.
Arabian Elises R US