Congrats with the new jordan mate seen it looks mint!! Im on a hunt for a manifold as well but im not on your market lol will keep an eye on your progress lad
I have a genuine Toda N1 full race system (4-2-1 manifold and full exhaust system with repackable silencer) in inconel but its for a DC2 not a EK4, not sure what you would need to modify to make it fit.
IIRC manifold is a direct fit, the B-pipe is a direct fit, the rear silencer fits over the axle but is too long for an EK...
its a re-packable rear silencer, it comes apart by drilling out half a dozen stainless rivets, if you then shortened the rear silencer can (5.5"dia alu tube) and the perforated silencer center (steel tube), it would slot back together and rivet back up (may as well repack it while your in there).
I reckon it would be a relatively easy and clean mod to do to make it fit.
Awesome exhaust, its like a regular stainless steel Toda but better (and a hell of a lot more expensive to buy new)!