I helped relentless rider put a used boondocker 2860 kit on an apex and he got a slightly used fastrax fuel controller for it. It seems like the controller is putting too much fuel coming off of boost and it wants to die and chugs some black smoke, if you feather the throttle it will stay running, but barely. After a few seconds of this it will idle okay. He turned the apex fuel settings to -35 and doesn't want to go any more than that. When riding the sled and messing with the settings it just doesn't seem to as smooth as it should. I am guessing that each box is made for a certain kit and maybe this box was meant for another brand of turbo kit. It sounds like Pure Logic makes a good box for BD kits. If anyone has a newer plug and play Pure logic for sale that would be great or any other info would help. Sorry long winded.