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Old 01-20-2011, 09:34 AM
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Default Removing cataylitic converter ?

Planning on removing the converter, my question is will this mess up the computor? Will I have to reset any sensors or anything else? I know I will have to weld a bung in the pipe for the sensor at the converter. I f anyone can give me some tips or any advice it will greatly be appreciated.
Running 3" pipe back to 3"dual tailpipes, no muffler but will have resonator tips on the end of the pipes.
Thanks for any help!
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Old 01-20-2011, 09:58 AM
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Hoping someone gives more detailed info.. but from how I understand it, removing the cat would mess up the o2 sensors readings (upstream to downstream) and could result in worse fuel mileage and driveability. The computer uses the results of those sensors to configure the air/fuel ratio's.
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Old 01-20-2011, 10:18 AM
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Thanks for the imput, I was told it would increase power and fuel mileage by removing it. I 've heard of people doing it but not sure what has to be done to keep everything running good.
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Old 01-20-2011, 10:19 AM
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Just swap them for high flow cats if you really want to, I don't think it will make that much difference. I was told mine are fine until going for boost. You will get a check engine light though. Some tuners can fix it.
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Old 01-20-2011, 10:37 AM
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no man you dont wanna do that just leave your cats on and get true dual like i did and dont put any mufflers on. I got good HP and torque and mine has that low deep pitch that sounds bad to the bone. without your cats not only will you get ticketed but you have that annoying popping noise also... yeah it will be a little louder but trust me people will do more laughing then aweing when they hear it backfire
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Old 01-20-2011, 11:02 AM
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Keeping in mind that you need a small amount of backpressure to help the engine make torque (what's needed most from a truck engine), I think you'll discover that the headaches involved will outweigh any benefit you might gain on the top end of the RPM curve. As for the 02 sensors, the upstream sensor is the only one used in the fuel curve calculation. The downstream sensor is used to monitor converter efficiency. Installing a free flow muffler and duals will get you the most benefit for the least effort.
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Old 01-20-2011, 11:11 AM
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Thanks Ramtech and everyone else
Yea sounds like I am opening up a can of worms that would be a big headache.
So if I run 3" pipe back from the cat with no muffler, split off into duals at the rear w/3" tips w/resonators how do you all think this will work?
The kit comes from LMC Dodge trucks
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Old 01-20-2011, 11:16 AM
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Quote:
Originally Posted by hemidoc View Post
Thanks Ramtech and everyone else
Yea sounds like I am opening up a can of worms that would be a big headache.
So if I run 3" pipe back from the cat with no muffler, split off into duals at the rear w/3" tips w/resonators how do you all think this will work?
The kit comes from LMC Dodge trucks
I have 2.5" but three will be fine.
without true duals i would go with 3"
with true i would go 2.5
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Old 01-20-2011, 11:17 AM
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It should work just fine if that's the sound you're looking for. Anything done after the downstream sensor won't be seen by the PCM.
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Old 02-15-2011, 02:35 AM
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All I did with mine was cut the resonator off and it gives it a little bit deeper sound, just not much louder at all, which is kinda what I'm lookin for. I wouldn't cut off the cat, cuz it'd be a computer headache as was mentioned but the muffler and resonator can go... I'm considering just putting on a higher flow muffler and leaving off the resonator. The resonator is what gives it a higher, more appealing (apparently), exhaust tone. It doesn't seem to restrict flow much. If you remove the muffler completely you'll get more of the back cackle, something I'm trying to avoid, just fyi... It's all in what you're lookin for...
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