Muffler delete= check engine codes and poor performance?
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Lead Driver
Joined: Jun 2007
Posts: 7,760
Likes: 27
From: Hampton, Maryland.
Muffler delete= check engine codes and poor performance?
Anyone ever heard of this? I bought a piece of 3 1/2" pipe with 35* bends in it in order to do the muffler delete straight pipe on my exhaust. I took it to a friend of mine's shop and he told me he didn't want to put it on. He said in his opinion, it would most likely throw a code because of the EBPV not getting enough back pressure( he says it should have 12lbs of BP) and that it would hurt performance because of less swirl in the heads because of the lack of back pressure(he said that it would probably drop down to less than 2lbs). I have never heard anyone mention this when the idea has been discussed here. He said that he would do it if I really wanted him to, but he didn't think it was a good idea. Any input?
Cargo Master
Joined: Apr 2004
Posts: 3,162
Likes: 1
From: Vilonia Arkansas
I know you said he was you friend but I think you might want to go somewhere else. straight piping an exhaust and reducing your back pressure isn't going to give you any codes. You want that exhaust outta there.
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Did you tell him it's a turbodiesel? 
Pretty funny the way he came up with numbers for the BP and talked about swirl like it was a NA gasser with valve overlap and all.
Pretty funny the way he came up with numbers for the BP and talked about swirl like it was a NA gasser with valve overlap and all.
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Postmaster
Joined: Jun 2006
Posts: 3,135
Likes: 0
From: Brinklow Md
mine hasnt really had the muffler on it since I bought mine if anything it made more power and theres no codes on mine either
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Mountain Pass
Joined: Nov 2007
Posts: 224
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From: Southwest Ohio
how about a double bullsh.it burger with a side of turd totts, because that is what he's trying to feed you. it is the best thing you can do to one of these diesels! have had mine done for about 2 years and still find myself reving it next to buildings and in tunels with the pass window cracked. 
Elder User
Joined: Sep 2004
Posts: 780
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From: Chicago suburbs
Originally Posted by HKusp
Anyone ever heard of this? I bought a piece of 3 1/2" pipe with 35* bends in it in order to do the muffler delete straight pipe on my exhaust. I took it to a friend of mine's shop and he told me he didn't want to put it on. He said in his opinion, it would most likely throw a code because of the EBPV not getting enough back pressure( he says it should have 12lbs of BP) and that it would hurt performance because of less swirl in the heads because of the lack of back pressure(he said that it would probably drop down to less than 2lbs). I have never heard anyone mention this when the idea has been discussed here. He said that he would do it if I really wanted him to, but he didn't think it was a good idea. Any input?
Take it to another shop. Or do it your self. It's not that hard. I did mine by myself, just took my time installing the 4" flow thru turbo back exhaust. At first with the muffler, then with the muffler delete pipe.
And if you are going to cut, measure, measure, measure. Because once you cut it, it's too late (Take it from me, 1/2 inch too short is too short), that's why I had placed the muffler on because the muffler delete pipe was now 1/2 inch too short and I had to get another.
Dave..