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Anyone know about RS stamped plenum?

Car  clio sport 172
I started matching and polishing the inlets on my 172 at the weekend and i noticed that the top inlet wasn't stamped with RS. Does anyone know why?
 
It was mainly the 182s that were RS stamped hence why the 172s show better gains from matching inlets.
 
Inlets are not supposed to be polished to a mirror finish better with a slightley rougher surface. You do want some turbulence in the inlet.
 
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