[DonSor]

I have a '99 Ranger 4.0L and I have given upon the tweaks that could significantly improve performance. I found nothing that is cost effective. Remember it's always the HP/weight ratio. Furthermore, trucks have lousy coefficient of resistance. Keep your vehicle well maintained, remove unnecessary load, tires properly inflated, easy on the acceleration, less idling, etc. could improve overall performance. No difference in pressure drop through the elements of an Air Hog or K&N and a regular filter. Afterall, the engine only uses a set amount of air for the size of the throttle thus fancy filters seemed a waste. By the way I got suckered into buying K&N air filters also plus I had to buy the cleaning kit, The return on investment was not too good.