Actually, you will feel the difference at 5500 to 6500 rpm. (Yes, I know I am evil since I rev my engine all the way to the redline and even slightly over.)
Alright! Since I keeps rpm low for FC purposes it should not matter.
Now if only Eroom can make sure the damm CEL does not act up.
OT: Myth or fact: reving all the way to the red line is bad for the engine.