the bell g2 and the g3 both had metal blades, the difference was that all the turbo models had tip weighted blades to maintain the inertia in normal flight to cover the lag in the turbo charger.
we tried tip weighted blades on normally aspirated 47's but they were a bit harder to handle rpm wise so we took the tip weights out.
most turbo 47's have had the turbo removed and high compression pistons installed. you wont notice much performance difference unless you wan to operate at high altitudes, makes no difference at sea level.