I have decided that I will not be putting yet another impeller in my seadra 15000. Would be nice to buy locally. I am open to drilling the body. My first thought was two smaller pumps that recirc and feed it off the spare display drain. Yes I am overstocked, Joefish.
Joefish, there are some rather large threads on reefcentral about ASM skimmers and mods you can do to them. There are tons of cool options to make them more efficient, including pump replacements. I've attached the link below to their useful ASM threads. It's helped me out a lot with my G3 so I hope it does the same for you. Good luck and happy reefing!
ASM G4 replacement pump???? 
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