just curious, if i remove the catalytic converter with that effect the engines performance at all? with the o2 sensors and all....thanks!

 

Cat delete from a 5.9 that has modifications to it will net up to about 15rw gain.
Need either a sim or plug non fouler to trick the pcm to seeing lower 02 readings or it will set of a CEL & put you into limp mode.

 

when i took my cat off , it felt like i gained power because it was louder and my foot was always in it.

but i put on a magnaflow cat for emmisions, and i was like WHOO low end lol. plus the magnaflow cat makes it sound alot better then just taking it off, its still loud too

 

dont do the SIM route, i had a bad run with one messing my tranny up and no one could figure out why. Use the non-fouler trick to keep your rear o2 sensor from throwing CELs.

 

i dont have the non-fouler in my 2000 and i have yet to have a check engine light

 

I went true dual (well almost I welded in an "H" pipe about a foot before the mufflers) on my '98 RCSB 5.9 4x4 and ran it thataway for almost 3 years and never got a CEL.

I did the EXACT same exhaust setup on my buddies '99 extended cab 5.9 4x4 and it popped a cell within about a minute of cranking it up when I was done. Did the non-fouler and cleared it. Came back two days later and I had to put some steel wool in the non-fouler. That got rid of the CEL for good.

What's the difference? dunno, just have to try it and see if you need one...

 

gonna sound dumb... but what is a non fouler?

 

Non-fouler pic

 

Wait, what? I have a hollow cat and occasionally get code P0420 Low Catalyst Efficiency.... If I don't clear it with my scanner, it'll go away after a few days or a couple weeks. Are you saying that when I have this code lighting up my CEL that it's in limp mode?? I don't notice it working any worse when I get it...

 

LOL ya that's why you guys out east are always late for work lmao jk. I've never had the limp mode on mine when i get the CEL for the catalyst.