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Old 07-31-2010, 10:50 AM
shhhhh, can you hear it?

 

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Question dpf/doc beat out

so i saw a post about someone trying to find an extra dpf/doc and beat them out so it looks stock but really its a run through......whats everyone's thoughts on this?or what about just running a pipe through the middle of it?anybody with experience on beating out catalytic got an opinion?
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Old 07-31-2010, 11:25 AM
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Wear a respirator if you are going to do this.

Also, eat breakfast first. That **** in the DPF is harder than Chinese arithmetic.

Last one I did, I drilled about 15 holes down through it with a 2ft long drill bit and started hammering away. I would have drilled more but the drillbit broke in the process. The cat comes apart real easy. One hit to the center of the catalyst with a punch and it's all over.
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Old 07-31-2010, 11:32 AM
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how is the flow?im thinking there might be some extra back pressure due to the expansions of the material being gone.but better flow than that crap being there.what are your opinions on it,is it worth it or what and should you have a good one to put on in case you go to the dealer?i wanna hear everything on this.i mean obviously this is only to get by checks in the states by state patrol or who ever but i would like all the info you have to offer.
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Old 07-31-2010, 12:21 PM
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Extra backpressure? You're basically flowing air through a big *** can...

And any diesel guy worth his salt can hear that it's hollow...LOL.
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Old 07-31-2010, 07:34 PM
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Quote:
Originally Posted by Big Angry Hillbilly View Post
Also, eat breakfast first. That **** in the DPF is harder than Chinese arithmetic.
now that's funny as hell!!!!
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Old 07-31-2010, 09:16 PM
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Originally Posted by Big Angry Hillbilly View Post
Extra backpressure? You're basically flowing air through a big *** can...
i get that but the way air flows when it opens into that larger chamber itll create a vortex creating back pressure,it will want to spread out over the whole area and i would imagine two of these chambers doing so would create some back pressure.obviously itll flow better than if the dpf/doc were working as advertised but just wondering if you thought that the flow would be a bad effect because of the vortex.but i guess im wrong in that thinking.
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Old 08-01-2010, 06:33 AM
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Originally Posted by 08pwrstrokr6.4 View Post
how is the flow?im thinking there might be some extra back pressure due to the expansions of the material being gone.but better flow than that crap being there.what are your opinions on it,is it worth it or what and should you have a good one to put on in case you go to the dealer?i wanna hear everything on this.i mean obviously this is only to get by checks in the states by state patrol or who ever but i would like all the info you have to offer.
A gutted dpf might fool them, but soot all in your tailpipe won't. And yes, they will notice the soot.
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Old 08-01-2010, 09:11 AM
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Originally Posted by 08pwrstrokr6.4 View Post
i get that but the way air flows when it opens into that larger chamber itll create a vortex creating back pressure,it will want to spread out over the whole area and i would imagine two of these chambers doing so would create some back pressure.obviously itll flow better than if the dpf/doc were working as advertised but just wondering if you thought that the flow would be a bad effect because of the vortex.but i guess im wrong in that thinking.
OK now I'm on board with your thinking.

I don't think it really makes a huge deal, but there is merit to your thinking. I imagine at higher horsepower levels this might become somewhat of an issue.

As for the sooty tailpipes? I see stock trucks with sooty tailpipes all the time, the DPF isn't real great especially if people don't maintain their truck or run ****ty fuel. They crack pretty frequently.
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Old 08-01-2010, 09:35 AM
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Originally Posted by Big Angry Hillbilly View Post
OK now I'm on board with your thinking.

I don't think it really makes a huge deal, but there is merit to your thinking. I imagine at higher horsepower levels this might become somewhat of an issue.

As for the sooty tailpipes? I see stock trucks with sooty tailpipes all the time, the DPF isn't real great especially if people don't maintain their truck or run ****ty fuel. They crack pretty frequently.
I can only speak for mine-spotless after 51000 miles, since new.
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Old 08-01-2010, 09:43 AM
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Mine is as well. 4....4000 or so?
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