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Evo X How Tos / InstallationsPost or link to your detailed how to / installation articles in here. If you have any questions regarding the how tos, feel free to post them in the Request sub-forum.
You do not need a relay. They draw 12A on the factory 15A circuit.
I managed to get mine installed in the center of the grill using a piece of aluminum flat stock but it did require some plastic air guide trimming.