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The exhaust manifold on the SC models running the 2ZZ-GE is a standard OEM Toyota header, I'm sure the 1ZZ-GE on the Elise S will also be a standard OEM Toyota item. It's so standard, that the EGR valve on the Toyota is not used that Lotus simply plugged it as a non-functional valve.
It is cast iron, and the pipes are definitely too small for optimal SC application. However, since heat is a big concern, make sure when running aftermarket exhaust manifolds, you either have the option of (a) running at least the top half of the OEM heatshield to not dissipate the heat into an already unoptimum temperature engine bay, or (b) ceramic coat the new exhaust manifolds before using or (c) at a minimum, use exhaust heat wrap to contain the heat. Last thing you want is adding more heat into the engine bay whilst gaining power.
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