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iTrader: (123)

I am putting together a home buitl ati kit. I have the option to buy a p-1sc for about 150$ less than a P-1sc-1. The difference being that the p1sc has straight cut impellar blade and the sc-1 has helical blades. What difference if any would that cause? I have read that helical blades will cause a boost jump down low, while the straight blades provide a more smooth boost transition throughout the powerband...?