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post #1 of 22 Old 09-16-2010, 04:40 PM Thread Starter
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Dual Exhaust Question

OK, I got a guy in town who can install dual pipes for me for about $150. This includes running from the downpipe back. The only thing is that it would be from the factory pipe size (3.5"?) into 2 2.5" pipes. Would this be as effective as doing a single 4" or am I just wasting money? Thanks for the help.

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post #2 of 22 Old 09-16-2010, 04:51 PM
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factory dp is 3 inch. and before i got my turbo back exhaust. i had dual exhaust from the cat back that was 2.5 inch on each side. sounded good and all but i got rid of them because i wanted to get rid of the cat. but for 150 thats pretty cheap. and that will be a pretty big difference since it looks like you have stock exhaust. but get what u want. i paid a little over 300 for my stainless steel 4 inch turbo back . so i would just get what u want. the only thing the turbo back would do would give you a bigger downpipe. or if you want duals then go that route. either way your egts will be alot cooler than stock

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post #3 of 22 Old 09-16-2010, 06:40 PM Thread Starter
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The cat would accidentally fall off while he was doing it. I did the same thing with my 7.3 and loved it. Thanks for the reply.

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post #4 of 22 Old 09-16-2010, 07:02 PM
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Don't do it, that's smaller than the factory pipe! I got my MBRP 4" Exhaust with Cat and Muff Delete for $260 shipped from Adam at FCDP. 4" FTW!

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post #5 of 22 Old 09-16-2010, 07:13 PM
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Originally Posted by SickStroke6.0 View Post
Don't do it, that's smaller than the factory pipe! I got my MBRP 4" Exhaust with Cat and Muff Delete for $260 shipped from Adam at FCDP. 4" FTW!
No it is not. 3.5" Down Pipe is bigger than stock 3". 2.5" dual pipes is bigger than 3.5" stock. 2.5" X 2 = 5"

A total of 3.5" tubing flowing to a total of 5" tubing
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post #6 of 22 Old 09-16-2010, 07:16 PM
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But you would only get 5 in. where the tubing splits, which is just in front of the rear axle. What's more important is the down pipe. It needs to be 4 in.

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post #7 of 22 Old 09-16-2010, 07:22 PM
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Originally Posted by trucktractorman View Post
But you would only get 5 in. where the tubing splits, which is just in front of the rear axle. What's more important is the down pipe. It needs to be 4 in.
4" is not a need for stock inj and turbo.
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post #8 of 22 Old 09-16-2010, 07:34 PM
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I've got a 4" straight piped turbo back into 4" duals with 6" tips. I can't think of anything that would get me to put 2 1/2 pipes on my deisel. He11 I run 3" duals on my Mustang lol.
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post #9 of 22 Old 09-16-2010, 07:56 PM
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for the money you would be far better off just doing a cat and muffler delete. 2.5 inch piping on a diesel is far to much restriction. If you are going to tune it you need a min of 4" to keep egt's down. I dont know a single person who would think it would be ok to go to a smaller than stock exhaust.

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post #10 of 22 Old 09-16-2010, 08:03 PM
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You are definitely the first guy I have ever seen contemplating smaller pipe that factory on a diesel lol. I am interested to know if the math (2.5" + 2.5" = 5" of flow) means that 2 smaller than stock pipes together are the same performance wise as a single 5" pipe.

Anyone know the number for Mythbusters?


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