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I beg to differ with you. Before I chose my JCW, I test drove peoples cars with 15% and 19% pulleys, Alta intakes, etc. The JCW was more refined. I'm not saying it is a huge difference, but it is discernible!
Stick a closed induction kit and a 11% pulley on those cars and you'll get the same level of refinement (noise (less) and power (less)).
I find my GRS Motorsport edition IC keeps my temperatures low on and off the track and road. It doesn't increase on the track, as you're always moving, and after sitting in traffic it's recovery times are excellent once moving again.