Any idea what this oversize exhaust is for?


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Old 05-13-24, 12:06 PM
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Any idea what this oversize exhaust is for?

Anyone have knowledge what the purpose of this oversize exhaust is for? Coal Rolling setup? Just to look different? The idea that it improves performance (trying to get the answer, I read how some think something liks this reduces back pressure for exhaust, but others say that the whole exhaust needs to be oversized for it to help?)


 
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Old 05-13-24, 01:38 PM
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Can't tell what size that exhaust is but diesel engines typically use 3-1/2" to 4" exhaust systems.
That would be about the right size for a diesel exhaust cap.
 
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Old 05-13-24, 02:45 PM
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On many trucks, especially if they are older or modified, the oversized exhaust tip is for looks. On modern trucks it helps cool the exhaust. You'll often see holes around the perimeter of the enlarged exhaust tip. The enlarged tip and holes are used to blend in cooler outside air to help cool the exhaust so things nearby aren't damaged by the heat. This is because when a modern diesel's emission system regenerates it creates intense heat making the exhaust even hotter than the engine does.
 
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Old 05-14-24, 06:28 AM
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It's an EPA thing.
 
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Old 05-14-24, 09:46 AM
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suspect its just for looks really no added benefit to reduce back pressure unless you enlarge the whole system

 
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Old 05-14-24, 11:20 AM
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As alan73 stated, the oversized tip will have no effort on pressure unless you enlarge the whole system. The thing you see is just a bolt on oversized tip on the exhaust pipe and it does nothing. It is for looks only.
 
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Old 05-15-24, 12:10 PM
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The inside end of the extension is probably partially open to allow fresh air to mix with the exhaust gases. The EPA standard is measured at the outside end of the extension.
 
 

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