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Why in the world would you want a metal impeller? WPs fail because the center bearing fails. When it fails, the impellers hit the engine case. If the impellers are metal, they will chew through the case and ruin the motor. If the impellers are plastic, they break off and save the case. What proof do you have that metal impellers make a better WP?
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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