I did this to my 1995' bronco, and a equivalant to a 200 K&n intake that is just a stupid big air filter...I have a k&n stock replacement air filter... not the fipk b.s. ... So i started out unscrewing the air box. Then you disconnect the 2 hoses out of the box. Take that whole bottom of the air box- to the front of the car tubing crap out. Then put the piece that attached to the 2 hoses back on, only put it on upsidedown.*with the breather hose, just use a normal replacement filter and attach it on some. I used a bunch of those plastic snap - zips to hold the filter in, and hold the air box in so it doesn't mover around, also use some on the breather hose. I have the 5.8l engine, and i notcied a difference as soon as i started the truck... you here a "hhhsssss" suction noise and can tell its less restricted... Ill post pics of it eventually when im finished and get the money to replace those 2 rubber hoses, with some bigger metal ones and get 2 cone filters to go with them like they use on imports. This mod. probably isn't the best for an offroad vehicle, but it works great on street. -rem

 

> and i notcied a
>difference as soon as i started the truck... you here a
>"hhhsssss" suction noise and can tell its less restricted...

I hear what you're saying but that does not necessarily mean you're generating anymore power as a result. This is why the stock airbox is oftentimes called a muffler or silencer box. Apparently the manufacturers think the general public does not want to hear the motor sucking air.

Again, good job but hearing the motor pull air is no substitute for dyno results.

 

[updated:LAST EDITED ON 09-Sep-02 AT 08:05 AM (EST)]
What I did on my 89XLT with the 351 was this -
1. Get the K&N replacement filter
2. Take the snorkel off the airbox that goes to the core
support and throw it away
3. Take your stock airbox and flip it upside down.
4. At this point you can either take a hole saw and drill
1 or 1 1/2 or 2" holes in what used to be the bottom of your air
box or cut most of the box away - you need to leave a perimeter
to hold the new element in place.

The opening on the original snorkel is not very large at all compared to the size opening you get trimming the airbox. You don't get very much ram air effect from the original intake - too many curves and too restricted. There was a noticeable seat of the pants difference in acceleration and power. Keeping in mind that the engine is just a big air pump, the more air you can flow through it - the better the performance. Combined with a free flow exhaust, it did make a difference.
My next step is to move the air box to the overflow tank/window washer reservoir location - puts it closer to the cool air coming in around the grill and headlight area. I'll move the overflow tank to the original airbox location .
I live in the Seattle area and have never had any water in the intake problems in the last 2 years I've been running this setup.

msautry
89XLT

 

> Keeping in mind that the engine is just a big air
>pump, the more air you can flow through it - the better the
>performance. Combined with a free flow exhaust, it did make
>a difference.

Keeping in mind that 99% of our trucks are speed density, the motor doesn't know that it's getting more air. But I do agree that a less restrictive intake and free flow exhaust can help _to a point_.

 

Sorry, I thought I could trade my performance intake for the band Cheap Trick here...