Ok i want to remove all cats off of my truck. Just got lt in and 2 magniflows. Local shop is running the pipe. I don't have a tuner yet but will be getting one. I don't want to know if it is illegal or if anybody is getting cancer from my exhaust. I have read hours of threads and that's all people say. I know i will have a check engine light until the programmer gets in. All i need to know is will it hurt my engine because of a/f ratios and is it ok for a short period. The lt already have o2 sensor holes in them. Thanks

 

I would at least put a magnaflow hi flow cat to be street legal and if you have check stations You going to need it and a 2 cat ( one on each bank) isn't gana hurt performance all that much ( at least compared to the factory 4 cat system) and you will still get a good loud sound

 

Visual inspection can not differentiate between a "high flow" cat, or a "hollow chamber" cat. I would go with the later, as most "high flow" cats will break down over a few years and will need replaced. Hopefully your tuner can disable the O2 and cat codes. May lean out your ratio some, but I doubt it would cause any issues other than a CEL.

 

Just a heads up, in case you weren't aware, but running catless often does nothing for performance, and in some cases will lose you power, this is something we test on countless vehicles on our in house dynos. The fact is that modern engines are designed to run with them and modern catalytic converters are so efficient that they really don't impede the exhaust flow. Take that and couple it with the stiff fines you can get for getting caught without them and it makes a lot less sense. Just some food for thought.

 

Ok i thought i made myself clear in the original post, but apparently not. If i had not said that i was aware of the law and everyone was just trying let me know i would appreciate it. I stated that i ONLY wanted to know if my truck would run correctly. I know all about performance. Both of my cats are stopped up and i am going to have to replace them. There is absolutely no reason for me to spend the money on them. I didnt think i had to go into such detail to get my simple question answered, but here you go.

I have a 06 ford f150 fx4( this truck is a strictly off road competition trailer truck that never gets on a federal state county or city road). I am running long tubes 2 magniflow mufflers (only because i cant stand the sound of straight pipes even for a short period) they will be dumped behind the muffler. So law doesnt apply and i am a stubborn stupid moran that is going to do this as long as my truck runs correctly. Can anyone please help me out and tell me

 

Get some spark plug non fowlers and screw them into the rear bungs.. This will space just the rear 02's out of the exhaust stream.. The fronts do not need cats to adjust AFR so just screw them in as close to the collector as you can get.. The rears just check for catalyst efficiency. Since you will have no cats, the rears just need to sniff a bit less to not trigger a code which could affect the AFR's causing the fronts 02's to constantly readjust..

You shouldn't need a tune or anything to keep that cel light off if you do this right.. I'd still recommend some high flows for the slight back pressure.. You will probably lose some low to mid range throttle response.. Top end power will be nice tho.. Good luck.

 

Exactly what i was looking for! Thanks alot especial86.

 

I find this hard to believe.

 

You said it, not me.
P.S. you mis-spelled moron.

 

When a post contains something like this:

"...I don't want to know if it is illegal or if anybody is getting cancer from my exhaust...."

I simply move on. When folks don't care about my health or others that share the air we all breath, there is no need to provide an answer.