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  #1  
Old 03-17-2010
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catalytic converters

i have an 03 ranger 4.0 it has 4 cat converters 1 off each header then 2 in a row right before the muffler if i take those two off will i shoot any codes and if so can i just reflash it to make the engine light go off it has a thrush muffler but i want it a little louder
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Old 03-17-2010
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Don't mess with the cats at all they are already high flow and you will not see any gain.
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Old 03-17-2010
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you can take the one off after the down stream o2 sensor but not the ones b4 the sensor
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Old 03-17-2010
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Quote:
Originally Posted by Downey View Post
you can take the one off after the down stream o2 sensor but not the ones b4 the sensor
Correct. Remove the last cat as long as it is AFTER your last 02 sensor.

I removed both of my cat's and installed one magnaflow highflow cat and had no issue after adding a de-fouler to the after cat 02 sensor. You can probably remove all your cats if you are going to run a de-fouler.
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Old 03-17-2010
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ok sweet does taking the one off affect the sound any
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Old 03-17-2010
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it will bareley mak it any louder honestly i would just get an aftermarket cat if you want louder


Or you could just cut the pipe after your last o2 sensor lol j/k
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Old 03-17-2010
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no dont mess with anything. No gain at all, sounds won't make a difference either
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Old 03-18-2010
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putting on the single Magnaflow high flow made a HUGE difference in sound output.

Do it if you want it to be loud. Just removing the 5th cat wont do alot. Removing them all WILL.
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Old 03-18-2010
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how much is a high flow cat? and where do most people put it?
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  #10  
Old 03-18-2010
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it replaces ALL your cats. Gotta have an exhaust shop fab it up if you cant. It will replace your Y pipe
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Old 02-10-2012
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Hey guys,

I have an '09 2.3 with California emissions
Is there an advantage to changing to 49 state cat?
The rig lives in WA now, wondered if the change would gain any hp or tq
Also thinking of removing the 2nd cat, no testing done here.

Thanks for any help
Richard

Last edited by grunt98444; 02-10-2012 at 12:30 AM.
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  #12  
Old 02-10-2012
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Save your money . Rangers come stock with high flow cats so you won't see any difference.
If you need more rear wheel hp or tq re-gear the rear end .
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  #13  
Old 02-10-2012
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Quote:
Originally Posted by StrangerRanger View Post
putting on the single Magnaflow high flow made a HUGE difference in sound output.

Do it if you want it to be loud. Just removing the 5th cat wont do alot. Removing them all WILL.
will it be a nice throaty sound or just a loud bunch of noise that sounds bad? any video we could see of this? thanks
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  #14  
Old 02-10-2012
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Thanks for the info,
It has 4:10's now
The plan is to upgrade the stock to 2 1/4" stainless steel Flowmaster resonator & 50 series deltaflow + a Magnaflow rear pipe
Also considering a MSDS ceramic coated header for reduced #'s & underhood heat, quicker cat light off and maybe a few more hp & tq
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