exhaust advise - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 17 (permalink) Old 06-21-2009, 09:32 PM Thread Starter
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exhaust advise

I am just about finsihed with my soild axle swap. I have to modify my exhaust right after the down pipe. I have a shop in town that will custom build exhaust. Beings I am going to need custom work on it anyhow I am going to have them do complete exhaust. Do I gain any pro's or con's of going 5" rather than 4". I am leaning torward the 5, But your imput and knowledge will be greatly appreciated. Thank you
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post #2 of 17 (permalink) Old 06-22-2009, 12:09 AM
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A 4 inch exhaust will flow quite a lot of exhaust. Unless your building a high horsepower, high rpm engine, stick with the 4 inch. To big of an exhaust can cause a lack of back pressure, and actually cost you power.

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post #3 of 17 (permalink) Old 06-22-2009, 12:48 AM Thread Starter
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Well, I plan on being in the 525 to 550 range. The next thing I will do is build the trans. to hold up. Would you say the 4" will still be most beneficial?
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post #4 of 17 (permalink) Old 06-22-2009, 12:57 AM
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Yes. I would stick with the 4inch.

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post #5 of 17 (permalink) Old 06-22-2009, 01:17 AM
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I have 5". I like the sound!!

Please post up some details and pics.

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post #6 of 17 (permalink) Old 06-22-2009, 01:30 AM Thread Starter
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its pretty stupid, but my reasoning for leaning towards the 5" was cause of how big the truck is, I am afraid the 4" will look too small, But id rather still have some back pressure.
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post #7 of 17 (permalink) Old 06-22-2009, 05:06 PM
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You can have a 4 inch pipe with a 5 inch tip. No one will be any wiser.

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post #8 of 17 (permalink) Old 06-22-2009, 07:28 PM
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I'm running 5" pipe with a 6" tip on the CHUM and 4" pipe with a 5" x 6" tip on the DMAX. Either way go it will work fine.

-Josh-
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post #9 of 17 (permalink) Old 06-23-2009, 12:34 AM
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You don't need any back pressure. It's a diesel, with a turbo. Backpressure = higher egt's. I wish I could explain further, spent all day on the lake and I'm charred!
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post #10 of 17 (permalink) Old 06-23-2009, 12:39 AM
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I'm no expert but having back pressure will increases EGT and drive pressure. Unlike a gasser that needs some back pressure to make torque; our diesels run better with no back pressure.

-Josh-
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