Modifying the inlet/outlet of a cat - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 14 (permalink) Old 09-13-2007, 09:28 PM Thread Starter
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Modifying the inlet/outlet of a cat

OK with the thread on the cali smog checks possibly coming it got me thinking about the cat. I still have mine in there but if these smog checks are coming I am hesitant to get rid of it. So I have to wonder if it is legal to cut off the inlet and outlet and weld on 4" tube to mate up to a 4" exhaust. In theory it should still work and of course still be a restriction but would be better than stock.

I guess the other option would be to make it easily removeable but I think that would throw suspicion and unless you have smog check shop you trust I would worry about being report, especially since Al Gore created this whole global warming stuff.

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post #2 of 14 (permalink) Old 09-13-2007, 09:35 PM
 
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Re: Modifying the inlet/outlet of a cat

Are you a 6 speed? My truck doesn't have a cat. I'd tell em it didn't come with one
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post #3 of 14 (permalink) Old 09-13-2007, 09:37 PM Thread Starter
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Re: Modifying the inlet/outlet of a cat

Yup 6-speed, and I look at the tag on the valave cover and it says its supposed to have a cat. Mine is also the 275hp mill.

I have already solve the restriction problems with my cat, we had a talk and I won. I am thinking more along the lines of a visual inspection. Nowadays they run VINs and can tell from the VIN.

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post #4 of 14 (permalink) Old 09-13-2007, 09:39 PM
 
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Re: Modifying the inlet/outlet of a cat

Move to Wyoming
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post #5 of 14 (permalink) Old 09-13-2007, 09:42 PM Thread Starter
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Re: Modifying the inlet/outlet of a cat

Aren't there gay cowboys up there?


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post #6 of 14 (permalink) Old 09-13-2007, 09:45 PM
 
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Re: Modifying the inlet/outlet of a cat

Probably a few.

That was actually filmed in Canada BTW.
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post #7 of 14 (permalink) Old 09-13-2007, 09:51 PM Thread Starter
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Re: Modifying the inlet/outlet of a cat

Sure.

Anyway I am thinking what I can do is pick up a 4" DP, a prebent piece for over the rear axle and some straight 4". Cut the inlet and outlet off on the cat, weld on some 4" tube and put it all together. I would have my own 4" straight pipe with a 4" cat. Should work. Should technically be legal. At the least it oughta pass the visual and I can get programming to make it pass the sniffer.

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post #8 of 14 (permalink) Old 09-14-2007, 12:02 AM
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Re: Modifying the inlet/outlet of a cat

If you are going to tamper with it and remove the restriction here is an option.
If you want the visual effect of it still being on the truck just remove it and ream the guts out of it with a steel bar and a BFH (sledge hammer). It is full of a honeycomb type screen element. Then reinstall the gutted cat and you will have the visual effect.

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post #9 of 14 (permalink) Old 09-14-2007, 01:30 AM
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Re: Modifying the inlet/outlet of a cat

But he wants to make it have a 4" inlet and outlet. the way I read it is will modding the cat to except 4" pipe will that make it fail the visual.

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post #10 of 14 (permalink) Old 09-14-2007, 01:51 AM
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Re: Modifying the inlet/outlet of a cat

Quote:
Originally Posted by Bushwakd View Post
If you are going to tamper with it and remove the restriction here is an option.
If you want the visual effect of it still being on the truck just remove it and ream the guts out of it with a steel bar and a BFH (sledge hammer). It is full of a honeycomb type screen element. Then reinstall the gutted cat and you will have the visual effect.
All of this is not necessary. The cat on these things is a pass through. It looks like the inside of a glass pack muffler.

I found one here to go in when the time comes: http://www.4wheelparts.com/PDT34889.aspx

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