More performance opinions
 

99 Expedition 4WD with a 4.6. I have a Diablo Flash programmer coming to tweek this motor. Would a K&N cold air intake help without doing any other mods. I am using this for ocasional towing. It has a 355 axle ratio. Thanks in advance for your input.

Nothing noticable.. The stock system is really pretty efficient and it pulls air in from the fenderwell instead of the heated engine compartment. I use a K&N replacement filter in my stock set-up.