wow $400, they better work amazingly. there r hardly any good junkyards here either thats why mine came from TN. I'm sure both work fine and the flex-a-lites are probably better, but if the ls1 fans do the job idk why ud need that extra cooling power. guess u can never be too cool, and btw doesnt ur thermostat determine how cool ur coolant gets? u might have that checked out.