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Oh. My. God.
If anything the standard 1*2 manifold / plenum looks far better than the Megane RS item.
And yes, it will strangle performance on your 1*2 engine, plus the port shape is totally different.
As Chip-mk1 said a number of us use the Supertechs, but I know of a people using Sinus valves with no problems at all.
I guess ultimately because of the coating and material used the Supertech's are 'more suited' to boosted / higher heat levels.