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Power Band

Maybe it's just me and my 170K mile 4000, but I seem to notice a strange
power band.  The power seems to peak at right before 4000 RPM and drop
from there.  I don't have much power above 5000 RPM.  My other car is an
old M3 and the power doesn't start until 4000 RPM and is strong all the
way until red line.  A different cam I know will help this, but should
it be as extreme?