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Old 11-22-2020, 04:12 AM   #1
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Removing catalytic converter

This may be a dumb question but I thought I'd ask anyway. I went to the storage yard to inspect the motor home as I usually do and started it. To my surprise I almost jumped out of the seat when it fired up. Upon looking under the rig someone had cut the catalytic converter out on the driver side. ????? I don't understand that as to why didn't they take the one on the passenger side as well? Anyway, is it really necessary to have it replaced or could I just have a piece of exhaust pipe welded on in the voided area? If that's possible should I do the same thing on the passenger side? That section of flange exhaust pipe with the catalytic converter is $1500 plus gaskets, bolts, nuts and labor. If I did replace it whose to say someone wouldn't come back and cut it/them off again?? Will it compromise the engine or performance?? I don't know yet if anyone else in the complex had theirs taken. I guess they'll been in for the same surprise when they start their unit if they were compromised.
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Old 11-22-2020, 04:30 AM   #2
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First of all I would report the theft to the local authorities, then contact your insurance company and check on your coverage.
The converter should be replaced with another converter. Otherwise you will be getting a "Check Engine" lamp lit constantly on your dash. Depending upon what the regulations are in the state you are registered in your MH may not pass emissions testing if it's required.
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Old 11-22-2020, 04:35 AM   #3
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most muffler shops will not remove a CAT. It is against the law.
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Old 11-23-2020, 08:50 AM   #4
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If the converter was cut out then a new can be welded back in. Any competent welding shop can do it. Catalytic converters for an engine that size can be purchased for less than $100.00. Installation will be another $100 or so.

Get an estimate. I wouldn't think of removing the converters. That would cost almost as much as having the missing one replaced.
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Old 11-23-2020, 09:18 AM   #5
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So, in a quick search of Michigan emission laws it looks like you don't have any testing done. I'm a "hotrodder" "performance enthusiast". That said, there are gains to be had by removing the other cat and opening up the flow in the exhaust system . If you are really interested, join a forum that covers the engine in your rig. You can learn the tricks to get rid of the pesky "check engine" light from removing the cats.
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Old 11-24-2020, 03:10 AM   #6
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Thanks for the comments. I did contact the insurance company and they are meeting me tomorrow at the storage facility. I'll be replacing the converter for sure. I did drive around and looked to see if any gravel had been disrupted next to any other motor homes and sure enough you could see that it was. I did take a peak underneath a couple of them and sure enough they were cut out as well.
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Old 11-24-2020, 09:42 AM   #7
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Thanks for the comments. I did contact the insurance company and they are meeting me tomorrow at the storage facility. I'll be replacing the converter for sure. I did drive around and looked to see if any gravel had been disrupted next to any other motor homes and sure enough you could see that it was. I did take a peak underneath a couple of them and sure enough they were cut out as well.
So it appears they are stealing them for scrap and not to use.
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Old 11-24-2020, 09:53 AM   #8
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If I were you... I would find a used replacement and hollow it out. Then go ahead and pull the other converter and hollow it out as well. At that point, an exhaust shop can legally weld them back in. They cannot remove and gut a converter for re-installation but you can take it to them and have them installed.
This has been done countless times for the reason of passing a visual inspection.
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Old 11-24-2020, 10:19 AM   #9
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Does the storage yard have video surveillance? I would guess they arenít responsible, but they might be able to help find the culprit. Depending on who did it, left unchallenged they may be back for other stuff.

I personally would replace it, but wait until you get it out of the storage facility.
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Old 11-24-2020, 02:47 PM   #10
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Does the storage yard have video surveillance? I would guess they arenít responsible, but they might be able to help find the culprit. Depending on who did it, left unchallenged they may be back for other stuff.

I personally would replace it, but wait until you get it out of the storage facility.
I agree. Replace the Cat with a new one and be done with it. Tampering with emission devices can be costly depending on where you live. Scrap yards are not allowed to sell used converters except to a registered recycler the last I knew.
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Old 11-24-2020, 06:15 PM   #11
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Not sure what part of MI. Great Lake Customs. Mount Clemens He can install.
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Old 11-24-2020, 06:29 PM   #12
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They will come back and do it again if there are no cameras or security at the site. and even if there are good luck..

My wife used to park car at a park and ride..They almost got hers, why they didnt I have no idea. It was part of the way cut off.

.They were stealing cats while folks were at work and cars parked in the park and ride...

They still steal them to this day from there...... Consider the amount of traffic at one of those....and doing it in the middle of the day to boot.
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Old 11-24-2020, 10:55 PM   #13
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This just happened to me (and a bunch of others at my storage yard) as well. They took both of my cats, so consider yourself lucky.

I'm told that there are exhaust sensors before and after the converter, and if the cat is missing it will cause the engine ECU to mess up the air/fuel mixture. Others say this is BS. I don't yet know which opinion is correct but thought I'd pass that along.

My insurance company has said they will cover replacement, less my $275 deductible, so I'm planning to replace mine.
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Old 11-24-2020, 10:57 PM   #14
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This just happened to me as well. They took both of my cats, so consider yourself lucky.
Curious if you filed a claim with your insurance...How much did it cost to replace them?
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