They don't really need a refurb tbh, I'd run them as-is.
Selby is most likely going to flip them within 2 weeks on facebook anyway..
Beware guys, he paints Hydras black as well, outrageous!
Although I'd say for these Hydras 300-350 is probably about right.
These Hydras sold for about 600-650:
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MY97 940 CD LPT Super Sports Edition 2 Turbo, Midnight Purple, 175,000 miles.