u dont need to rev them (rb30) out to make big power, as they make the same power as other kits at lower rpm. plus u cant go expecting to rev a standard crank to nything near 10k like u could do with say a HKS, caus the HKS is full counter-forged, its like comparing apples and oranges
my rb30 is pretty much finished, im just waiting on the sump and my adapter plate to be ready (i've made my own adapter plate)