Looking at the GasGas partlists, there hasn't been a change in part number since 1996 all the way through the 2010 EC and MC's throughout the 15 yr. span. ME25610007 is the part number on the 2010 model which is the "plastic" impeller. GoFasters sells the alloy impellers, so maybe someone decided that it was a good investment to put one on before they sold it is a possibility.
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