Got a F-250, 6.0L PStroke. Looking at several different Air Intakes. I see the replacement filters are like $70. Is it best to stay stock? I can get an AFE on Ebay for $250. What's everyone's thoughts on what I should do. I don't want to jeopardize my motor by letting any extra dirt in... I'm not looking to trick out my truck too much, if an after market air filter is better letting the engine breathe, that's what I want. Also, my truck has 4" exhaust.