The IWG is available only with the 0.92 housing. I doubt it would control boost, and if you run an EFR too fast you can damage the turbine. If you want to run a 9180 flat out maybe buy the 9174 instead — the turbine wheel might hold up better.
CES runs an EWG 9180 with 1.45 housing and I think they said they can get as low as 22 psi with just a 44mm external gate but you should double check that psi — the number 16 psi also pops into my head, which would seem hard to believe but maybe the big housing slows the turbo down enough.
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