Yeah, main battery cable and grounds. I will need to run a fuse box feed, but that's easier.
So I hear trailer tow wire works as extension for the airbox. Is there a 7 wire? and is the gauge large enough?
I wouldn't do that. the AFM leads are what, 18ga? 7-way trailer cable is 6-12/1-10 (that is 6-12ga and 1-10ga) overkill. solder in new wire of the same size as OEM, and heat shrink the connections.