6000rpm? Man that's just before redline....

You won't really feel it or hear it with an exhaust...I never could. You can sort of pick it up with a pod filter attached, but even then it's pretty hard to tell on WOT.

From my experience, it seems to come on between the 4,000-4,500 mark. I can't be any more exact until I get the V-AFC2 wired up.