The question is if I get rid of the catalitic converters is it going to cause any problems. I intend on keeping the o2 sensor. I was thinking of getting dual exaust with some turbo mufflers. Anyone who has done this to there truck chime in please.

 

I hope you don't have inspections. That type of exhaust would be illegal. That being said, people do have duals custom made, though around were I live you would never find anyone willing to weld it up.

There should be no problems unless the reduced backpressure decreases the egr function too much. Maybe someone who has done will write in and say if they got a check engine light or not.

 

Oh yeh, this works great..The exhaust, definatley will not pass an emissions inspection in most states, as emissions control is the purpose of the catalytic converter. You may want to reach out on a limb and claim for off-road or farm use only, if faced with pesty emissions regulations.You will have no trouble with your sensors, nor egr system..However- you may want to throw away your air pump and other emissions devices, as they work in conjecture with the catalytic converter. Unfortunatley, they are now doing nothing but causing drag on your belt system. Then you will have to re-route EGR vacuum, and change serpentine belts- if you want to eliminate the entire emissions control system.

I have done this to several EFI trucks, turbo mufflers and all, and it offers an inexpensive way to upgrade a stock exhaust- it will really open it up. If you have a performance camshaft, you may consider expanding your pipe size, after doing a little research on your cam.
Good Luck however you decide to go about it..

 

You will get a check engine light if you mess with the air pump system and the egr.

 

Or you could take your cats down and hollow them out. I have known people to do that.

 

Franklin- I agree if you try to modify the EGR. As long as you don't remove the EGR, you should be okay. However, I politely disagree on the air pump.
I know of no sensor or actuater that is affected by the existance of an air pump. My old firewood truck ,that i drive weekly, has a 300 EFI that I tossed the air pump and other emissions- no problems. Here is a link to a pic of a 302 EFI that has no air pump.http://www.fordcobraengines.com/302%20EFI%20Polished%20Engine.jpg F150forums has a list of diagnostic trouble codes for the Ford ECM- it will reveal more information on this, if anyone is interested.However, not to get too far off the post. If a person thinks the air pump will cause a problem with its removal- Leave it! Its not hurting anything, but may cost a minimal fraction or so of a horse out of the team. Like throwing an extra saddle blanket on that baby.

 

Franklin- I agree if you try to modify the EGR. As long as you don't remove the EGR, you should be okay. However, I politely disagree on the air pump.

I know of no sensor or actuater that is affected by the existance of an air pump. My old firewood truck ,that i drive weekly, has a 300 EFI that I tossed the air pump and other emissions- no problems. Here is a link to a pic of a 302 EFI that has no air pump.
www.fordcobraengines.com/302%20EFI%20Polished%20Engine.jpg
"If you delete the smog system you'll need to plug two holes in the back of the heads. Ford sells the plugs, but you can use two 1" long 5/8-11 bolts for 1/10 the cost. The holes probably won't look threaded when you remove the smog tubes, but clean out all the carbon deposits, and you'll find that these bolts will work.If you're using A/C and an alternator without under drive pulleys, the belt length is 70.5". "Google a list of diagnostic trouble codes for the Ford ECM
https://www.ford-trucks.com/forums/5...-efi-help.html This post will help reveal more information on this, if anyone is that bored.
p>However, not to get too far off this post. If a person thinks the air pump will cause a problem with its removal- Leave it! Its not hurting anything, but may cost a minimal fraction or so of a horse out of the team. Like throwing an extra saddle blanket on that baby- not enough to worry about.
</p>

 

Here's some pics and a sound clip of the 2.5" - 3" single system on my '90, the motor specs are in my sig line. This system incorporates a Magnaflow high volume converter. New Exhaust - a set on Flickr

 

I like the sound on mine, no cats (came that way) and dual turbo's. I just turned them out in ft of the rear tires, pics in my gallery. Glasspacks sound like poo imho

 

I thought possibly you would get some codes like a 44, 46, 81, 82, or a 94. And there are some TAB and TAD solenoid valves that are mounted with the plumbing on the pump.

44 Thermactor Air Injection system inoperative (Right side).

46 Thermactor air not bypassed during self test.

81 Air management 2 circuit failure (AM2/TAD).

82 Air management 1 circuit failure (AM1/TAB) .

94 Thermactor Air Injection system inoperative (left side).

 

You are one smart cookie, Franklin2, I can see why you are "the man".. although your check engine light will not come on, the codes will probablly display during the KOEO/KOER after the ECM interface is activated for diagnostics. I really am not sure, but you definatley got the curiousity up. A 94 or later, probablly will flash its CE light. Shall we test?

This is very good material coming out of this post..we should do one on Engine Management systems.

 

The info I gave is a little bit general. I have found out through the years that not all the EECIV computers were programmed the same, so maybe truck will not spit these codes out, where a car would. So I guess real world testing by someone would be in order.

 

Some codes dont turn on the cel, so it wouldnt be an issue

 

i've done it to all of my f150s and no lights no nothing when i do it i do away with the air put and the exhaust tubs on the heads we just block off and if you have your o2 still you will be find as of now on my truck i dont have an o2, cats, mufflers, and air pump or the exhaust tubs on the heads and it dont have any lights on and it runs find

 

I used this setup with a Flowmaster 40 split into dual outlets. This set up works fine with speed density system, and sounds great.

http://www.performancepeddler.com/de...CT_ID=MAG93307