Does anyone know if you will get any computer faults from removing the cats on an 04/05 with a 5.4 3v

 

Yes you will get OBD codes if you remove your cats. It is also illegal but you already know that.

 

I'm not for sure, but I'd think you could remove the rear two converters with no problems.

 

Is there a way to trick the computer so it doesn't register a fault

 

Yes you can remove the back 2 converters with no problem whatsoever, but not the front 2. I have removed the back 2 with a magnaflow siso. It runs fine, but I would hate to have any less backpressure than what I have now.

 

Hi.

Can you please describe what you think you will accomplish by doing this?

If this remains a hypothetical question, then the answer is Yes, and you can summarily ignore the following diatribe. If not, then read on...

Better flow? No - the stock cats flow pretty well on a stock motor.

Better performance? Nope - none that you'd notice.

Noiser? Yes , but with the stock muffler, not by much.

Coolness factor? Perhaps on a planet where the sky is a different color.

Add even more pollution? Yup. Ohio and everyone downstream ( that includes me) certainly needs more of that, eh?

Seriously, the trick here, to avoid a socially irresponsible blunder such as this, is to reconsider what it is you are doing.

At least consider, if you have this burning need to f**k with your cats, replacing all 4 with a pair of high-flow ( Magnaflow, for example) units. This is the proper way to deal with this. Not necessarily for performance (with your mod level, you won't see any) but to ensure the emissions remain acceptable.

Future generations will thank your contribution.

All things are possible - but not all things that are possible are smart.

cheers

 

Removing cats is a Federal offense, the fine is substantial. It's something like $2500 per removed cat.

 

Hey dsp921 I was wondering how you would ever get cought for not haveing cats?? I have no cats on my truck and i didnt have any on my mustang 5.0 i had and i never got cought?

 

sounds like someone needs a... HYBRID...AWWWW if i was worried about emissions i wouldn't buy a big truck...i'd bought a PRIUS.

 

Hi Pay;

Actually, my 2000 F150 posts better emissions results than my 1988 Mustang GT ;-)) And carries *way* more topsoil !

Seriously - it's not good to eff with those cats unless you preserve the intent of them being there in the first place.

"Not getting caught" is perhaps the dumbest excuse for a response I've seen in quite some time. I need Max to jump on this one as only he can do... fresh meat !

Cheers

 

i don't have much to say about the f150 posting better emissions than an 88 mustang gt...my guess would've been that much dealing with the advances in technology in the 12 years leading up to the creation of your f150... what would shock me though was if my 1998 f150 posted better emissions than my 1998 escort the point i was trying to get at was that if his main concern was the environment then he'd be fine with a hybrid, but obviously his main concern is (what most of everyone in america's is) what he likes...he doesn't like a hybrid, he wants a truck...and if he wants a big truck that sounds nice and has a little ***** to go with it who should fault him...IMO if you want to make the most impact with this "save the environment" stuff you should head over to the SuperDuty page and start on anyone who owns anything with the words "PowerStroke" in it ...i just find it hard to get all worked up over the minimal difference in emissions between being catless and with cats and what all of black smoke from a diesel...i could probably run my truck to work and back for a year without cats and the difference in me having cats would be less than one diesel making a quarter mile run at the local track. hope i didn't get anyone's panties in a bunch i just don't see all the need for a fuss over losing 2 of the 4 cats you have if it's what you want to do with your own truck...

 

Getting caught isn't a huge risk, but the cops around here would routinely check the exhaust and such if they pulled you over for anything else. They see a modified car and they try to bust your stones somehow. There's also the yearly inspection to worry about. There's always a chance you will get caught, and the price is pretty high when you do. Unless you have a race car the gains aren't worth it. Put on high-flow cats and rest easy. The law is that you can't remove or tamper with any component in the emissions system. OEM cats are supposed to be replaced by the car company for the first 50,000 miles or 5 years, so technically you can't go aftermarket until then, unless the OEM ones are damaged or proven to be non-functional by an official inspection station.

 

actually if u have ur air fuel tuned properly it should keep within emissions regulations. but some people just cut their out and either pipe through them or run a pipe through them

 

Hi!

Well emisions has never been a real problem because we don't have any kind of organized inspection here in Arkansas. They reserve the right to pull any unsafe car over on site. This means if you are really loud or smoking really bad they will stop you. (This is good and bad IMO) However...the truck has 4 converters on it. Have you seen the inside of these things? HARDLY promote good exhaust flow. Now the front two could never be touched, but when I removed the back 2 and put on a Magnaflow SISO I felt a real seat of the pants difference. There is also no annoying drone or anything else as I left the exhaust exiting the rear. While I would not intentionally harm the environment (I depend on the land for a living), I don't think my removing 2 of 4 converters will kill any trees around here. But cars do have exhaust emissions. You are harming the environment everytime you fire that baby up. Perhaps a bycicle wouldn't? Of course a steel mill and a rubber factory had to produce the bycicle and tires, so that would be some emissions too? Maybe you could turn Amish and walk. Just my observations...not to offend anyone.

DEL

 

if you remove the rear most cats it should throw a code (like po430 i think or po420). so what you need are MIL eliminators, to keep the rear o2 sensors from throwing that code, you can buy them lots of places (including ebay) or you can build your own if you can solder. go to
http://www.fordmuscle.com/archives/2...ale/index.php#
scroll to the bottom of the page and click on "make your own" and it'll give you a wiring diagram with radioshak part #'s.