Some people say the blues are stiffer, but after riding in a car with the blues and riding in my car (before I changed to my current setup I had GR2's) I didn't notice any difference.
Stock is a stamped impeller (as seen in the pic ^^). Most of the aftermarket ones are cast impellers and I've seen several impeller failures in my time on the forums... I bought one from the dealer for that reason.
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