I am looking for some more power out of our 99 Expedition... I am planning on one of those K&N FIPK kits or whatever it is called. What else do you all reccomed for some extra oomph? Thanks, Austynn.

 

Good and cheap don't usually go together. You should think about a good after-cat exhaust and maybe a programer/tunner

 

Are you looking for just bolt on mods or do you want to get more involved than that?

 

cold air kits are not worth the money

 

The K&N or any oiled air filters have proven problematical on these engines. The oil makes its way to the Mass Air Flow sensor and causes trouble.

As was mentioned, cheap is not the way to go. Even the programmers and exhaust systems will give only incremental gains.

The 4.6 makes reasonably good power and if properly maintained will last a long time. It is very common to start having problems with an engine when you start tinkering with it. If it ain't broke, don't fix it.

Good luck,
Doc

 

Never had any MAF soiling from a K&N filter in my Truck or Mustang. The Stang has had one for over 150,000 miles. Over-oiling when servicing the filter is what fouls the MAF.
A DiabloSport Predator is the way to go. It has really waken up my 2001 5.4L, and I only run the 89 octane tune.

 

Proven by who? I have an airraid intake and filter for over 2 yrs. and have had ZERO problems. It will cause MAF problems if the filters are over-oiled, but if maintained correctly there is no problem.

Is this from personal experience? If Ford had made the truck perfect then I wouldn't mess with it, but there's always room for improvment. If done properly, mods can increase performance and effeciency. Come on, customizing your truck is half the fun of owning it.

 

There are other threads on the oiled cotton gauze filter issue. As a user of K&N filters for many years on many different vehicles with no problems whatsoever, I refuse to accept the criticism. My '97 5.4L Expedition was sold a few months ago with 107,000 miles. It had a drop-in K&N since the first week I took it home from the dealer.

Over oiling the filter can theoretically foul the MAF, but under normal around town or highway driving conditions you don't need to oil the thing for many years and if you follow the instructions, it won't get over oiled.

Now, having said that, these filters, including the AirCharger type are not going to produce much extra benefit unless you also go with a good free-flow cat-back exhaust and a programmer. The cone-type filters will make a LOT, read this LOT of noise and make you think it is producing more power. It is highly unlikely that if you do a before and after with a stop watch or an accelerometer like the G-Tech Pro Competition, that you will gain even one tenth of a second in the quarter mile with just a filter change.

I like the K&N, not because it produces more power, but because I drive in very dirty, dusty conditions and these filters work better when caked with dirt than paper filters do.