ok so I also removed the lower border on the roof scoop grille but I got to say that combination of the RLS IC + fetting + scoop grill mod = wow
I don't have any measuring equipment of any kind but my fingomometer is impressed, before when driving around(either spirited or sluggishly) if I were to park and pop the hatch and feel my IC it was HOT HOT HOT... when I felt it after my drive tonight the SC outlet tube(left) was HOT as was the left side of the IC, but the right side of the IC and the right IC tube were cool to the touch.
I'm still planning on putting some heat shielding (possibly re purposed dash shades) underneath the IC to protect against engine bay heat a bit more , but I am impressed