what to do first? cold air intake, or dual exhaust? I have a 04 reg cab 4wd, 3v 5.4 with a 8ft box, exhaust will run catback out the side just like a lightning.

Not sure what air intake kit to use or what brand of muflers to use, right now $$$ dosent allow for booth modifcations at the same time and will using a a coumputer tuner accomplash any thinG?

I want to improve milage and add some extra punch

 

If you decide to do exhaust, Magnaflow seems to be popular with the '04s-'05s.
Check out this thread, there is a coupon in there somewhere (if it hasnt expired anyway):
https://www.f150online.com/forums/sh...=&pagenumber=1

For intake, they are all going to do about as good as the other, so I would go by price or looks.

For your mileage and performance though, a chip/tuner would be the best thing. http://www.troyerperformance.com is a good place to start.

 

 

Lonnie

I would respectfully disagree on the recommendation for an air intake system. It has been reported on these forums that the new 3v 5.4 engine is particularly finicky with respect to aftermarket air intakes.

It is my understanding that there is currently only only kit available today that increases power, BUT does not cause engine damaging leaness. It has been reported on these forums that simply bolting on one of the other brands caused the engine's air fuel ratios to go drastically lean (19:1). This drastically lean condition could burn stock pistons in seconds.

It was reported on these forums that Airaid was the only kit to make additional power and not cause dangerously lean AF ratios.

I'm no expert - just related what I read here.


enb

 

I find it hard to believe that an intake would cause a lean condition on a fuel injected engine. I would think for a lean condition there would have to be another problem. The sensors on the engine should always be adjusting the air to fuel ratio....on an older carb model I could see it happening if the carb was not rejetted for the increase in air flow.....

I could be wrong, but I think there are other issues if the intake causes a lean condition.

To answer your question though...I have heard that a chip is the most bang for your buck.

 

I'd also like to see where you heard that at?

 

The info I got was from Mike Troyer. He related the essence of my previous post to me in a phone conversation we had. He has also posted these same information himself.

Summarizing: He was doing R&D testing of intake kits for the new 5.4 3v engine last year with the vehicle on the chassis dyno and testing the various kits. Fortunately he was monitoring AF ratios as well as other engine data. One intake caused the engine to go drastically lean (19:1). The disturbing thing was that the engine did not throw a code whe this happened.

I am told that the new trucks have a different intake setup -- different from the old MAF that everyone has seen. I don't have a new truck, and the local Ford dealer has not allowed me to disassemble the intake on a new truck on the lot yet, so I can't describe in detail the differences between the old and the new.

https://www.f150online.com/forums/sh....4+intake+lean


That is one of the posts where he relates this info about the new 3v intake.


enb

 

I'm not in a rush to do the air intake, I was going to buy a K/N fiilter but most of the kits out thier have a canister type filter so the square K/N filter will not work.

I have also read post's were some f-150 owners are skeptical regaurding the k/n filter because the air inlet in the the left fender is limited in it's size.

I also wounder if a ram air hood set up, or mustang type shaker hood would benifet performance as the air flow would be directly over AND INTO the TBI

Im still in carburater mode, filpping the air cleaner up side down worked wounders on a 73 400 cubic inch ford (351 ) SO I'm way behind in technolgy.

I can buy a lot of gas for the cost of theas air intake kits, in canada their not cheap, might be worth the drive into Great Falls Montana to a pep boys...