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SWRD 3 port. They use the Pierberg unit Prodrive used to supply and Darrell also supplies their own cable adaptor harness with them FOC so they are plug and play.
A 3 port is a 3 port and the SWRD is a proven model as used by Prodrive and even comes with a plug and play Subaru harness. Plus it's less than half the price of the Grimmspeed unit.
If it's personal preference then fair enough, but spec and price certainly point to the SWRD unit IMO.