I would def do the fass or an airdog, but not delete the stock fuel filter. It doesn't really offer any real benefit besides saving like 20 bucks on a new filter every 10-15k miles. If your lift pump ever takes a crap you'll be stuck because the stock fuel filter head is gone, I'm literally in this situation right now. The pump will not turn on and my truck is barely starting, if I didn't have the stock filter head I would be screwed. So I would 100% keep it
