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4" or 5" Exhaust?
Written by Patrick Ellis
We get this question almost daily from customers. So let's start at the beginning.
Regardless of which size you go with, you'll be getting better flow, less backpressure, and a better sounding exhaust. The 4" system is designed to be a quick, easy upgrade. Because the stock exhaust is 4 inches, you can re-use the rear half of the stock system and save time installing the aftermarket downpipe and DPF delete. The pipe just bolts up! As far as sound, the 4" is noticeably louder than stock and some drone exists in the mid rpm range. Whether this drone is unbearable varies by individual, but in my experience, is no louder than any other aftermarket system. If its too loud for your liking, a muffler can be added to quiet it down.
The 5" system is louder - and deeper - than the 4" kit. It replaces the entire exhaust from the turbo flange to the tailpipe, so none of the stock exhaust is re-used. It allows for maximum flow and the lowest possible backpressure. Typically, the 5" system is purchased by those wanting the loudest sound and best flow - for high horsepower applications.
Posted in Dodge Cummins 6.7L
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