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Pre catalytic or pre heater delete       #: 2242
 Moderated by: NoPower, Mike69, MaDMaXX
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 Posted: Thu Sep 3rd, 2020 02:17 am
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Eddie Money
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Im looking into exhaust for a 2010 ranger sport 4x4. MaDmaXX mentioned in a thread deleting the 3 pre catalytic converter or pre heaters. The muffler shop that I'm having do the exhaust mentioned that removing the pre cats could potentially throw a code.

Has anyone else done this? Did you get a code? If yes, how did you go about clearing the code?

I've read that you can use anti fowlersl and an o2 sensor to fool the computer. Anyone do this?



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 Posted: Thu Sep 3rd, 2020 02:20 pm
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hmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
Maybe I have deleted cat converters a time or seven
And maybe I found out that there are no codes when you do so
And maybe it is because the function of the catalyst is to burn un spent fuel....well if your engine is running properly like a good 2010 SOHC engine should, then there will not be a bunch of un spent fuel to be catalized.......so no codes have ever shown up for me. Not one of our trucks still has primary or secondary cat converters still in place (hollow chambers)
and None of us have codes..............BUT I have not done this with anything newer then 2001, IF I did it at all....lol

So there are PRIMARY cat converters which are the small ones in your Y pipe, 
(the first 02 sensor is upstream of the PRIMARY cat) (B1S1 and B2S1)
then the downstream 02 sensors (B1S2 and B2S2)
The second set of sensors is also known as "catalyst monitors" because that is all they do, monitor the function of the cats.....they do not do much. 
The upstream sensors are the ones that do all of the oxygen sensing for the PCM to adjust fuel/air.
Then you have your secondary cat converters, behind the catalyst monitors...these things you an delete all day long and will have no ill effects and you can pass emissions in most states without them since they were only required for FEDERAL emissions. CA and others may be different. Here in Idaho we do not have tail pipe emissions YEAH!

So in conclusion cat converters are awesome, unless you like free flowing exhaust. I have never had a code from having NO upstream/primary converters in place on OHV, SOHC or 5.0 trucks...
Now that I am in Idaho I can say my primary cat converters were always just there for "looks" while the honeycomb catalyst inside was MIA..... where did it go? MUMS THE WORD

Also your primary converters are worth anywhere from $65-150 each, secondaries, $40-100 each.........just sayin.

Clear as mud? goodie



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 Posted: Thu Sep 3rd, 2020 04:24 pm
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Eddie Money
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I need to have all the sensors but I can delete the primary cats and just run the secondary cat and my air/fuel mix will be good? 

I know stainless is the better quality for exhaust. Do I need stainless a stainless catalytic converter?

Heres the exhaust we are considering



https://mbrpexhauststore.com/s5226409-mbrp-cat-back-single-side-ranger-98-11-t-409-ss/

Last edited on Thu Sep 3rd, 2020 04:31 pm by Eddie Money



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 Posted: Thu Sep 3rd, 2020 05:35 pm
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delete the SECONDARY cats
New exhaust from the rear 02 sensors back
This is what most people do
That MRBP kit is nice!

To take it a step further would be to delete the PRIMARY cats (upstream, the ones closest to the engine, they should be in your Y pipe on a 2010) 
You do not need stainless steel cat converters to get an all stainless steel system would require stainless headers, stainless downpipe, and stainless cat back awesome but not really needed. :)



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 Posted: Thu Sep 3rd, 2020 06:04 pm
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Eddie Money
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Ok, I was getting to that. Lol. Secondary cat delete is the preferred method.👍.thanks buddy!!!



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