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Old 07-09-2007, 06:12 PM   #1 (permalink)
sewerrat
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removing the cat....

I'm not much of a diesel mechanic, so I'll ask this silly question, do our diesels (the 6.5) have a catalytic convertor??When I crawl underneath my truck would it be the black pot that is bolted in between the pipe, or the exhaust pipe coming from the turbo?
If so can I remove that thing and put in a straight piece of pipe, I thought I'd ask, and with this thing removed will it might give me some more power or should I leave it alone.

If it is removed would the check engine light come on?
or what else can happen to the engine.

Menno
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Old 07-09-2007, 06:14 PM   #2 (permalink)
z79outlaw
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Get rid of it. You wont regret it. You check engine light will not come on. No wire of anything going to our cat's. The only thing that will happen to your engine is it will cheer up and run alot better.
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Old 07-09-2007, 07:20 PM   #3 (permalink)
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Let's not forget the smoother take offs and better fuel economy. Best thing I did to my 6.5. It won't hurt to get a cold air intake as well.
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Old 09-19-2007, 06:30 PM   #4 (permalink)
Matt Bachand
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I am giong to take mine off tomorrow, what size piping do I need as a replacement? (width)

what are the best clamps to use that seal?

I am getting a 4" jardine turbo back soon, but not soon enough
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Old 09-19-2007, 07:21 PM   #5 (permalink)
z79outlaw
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Stock size should be somthing like 2.75". So for my truck when I got the exhaust done I had the shop custom bend up a 3" straight pipe, the 3" slid right over the stock size perfectly, and then they welded it on. I don't think I would try it with muffler clamps though. But I would check your exhaust size and the I.D. of the 3" before you cut off the cat if you try this route, since not everything works as good for one person as it does the next.
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Old 09-19-2007, 07:30 PM   #6 (permalink)
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I took the existing cat and hollowed it out. Works great and looks stock from the outside.
A piece of conduit cuts through the insides pretty well. Shake out the pieces...
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Old 09-19-2007, 07:51 PM   #7 (permalink)
Matt Bachand
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Quote:
Originally Posted by Jake;2013906;
I took the existing cat and hollowed it out. Works great and looks stock from the outside.
A piece of conduit cuts through the insides pretty well. Shake out the pieces...
Jake

That is what I want to do, any clue how I can put it back on without welding?
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Old 09-19-2007, 07:52 PM   #8 (permalink)
Matt Bachand
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Quote:
Originally Posted by Jake;2013906;
I took the existing cat and hollowed it out. Works great and looks stock from the outside.
A piece of conduit cuts through the insides pretty well. Shake out the pieces...
Jake

What I want to do, any idea how to re-attach it without welding? some sort of larger pipe 3 " long and 2 clamps on each side?
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Old 09-20-2007, 10:08 AM   #9 (permalink)
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Quote:
Originally Posted by Matt Bachand;2013963;
What I want to do, any idea how to re-attach it without welding? some sort of larger pipe 3 " long and 2 clamps on each side?
Band clamps, like the top one in this picture:

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Old 09-20-2007, 10:18 AM   #10 (permalink)
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The 10 & 21 would be my choice as it allows for removal & reinstall of the cat or cat test pipe (no one here advocates illegal act of permanantly disabling the cat) but we do subscribe to testing for a plugged cat with a test/bypass pipe, and maybe the occasional removal of a cat for enhanced performance off road. Now if one had a Diesel Pro SED (smoke-extruder-device) best of both worlds, a modified cut out when activated uses pressure control to open an exhaust cutout so you get a quick dump of gasses prior to going thru the cat, and when needing to be street legal switch off the SED control circuit so gasses flow thru cat as prescribed by mfr.

The 60 style clamp tends to put a crimp groove in the inner & outer pipe, great for a better leak free seal but not so user friendly to separate test pipe when it is crimped to the other one
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