Bigger exhaust better?
I am about to re-fab the exhaust back to my compound turbos. I have plenty of stock exhaust pipe and it would be really easy. Just wondering, Honestly, does a bigger exhaust such as a 4" or 5" make a big differnce in egt's or is it just a big money maker for some of these companies.
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The difference between 3" and 4" is huge. The more air you can get in (high flow filter) and out (4 or 5" exhaust) - the better. Unlike a gas engine, a Cummins needs little if any backpressure
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With twins you should run 5" as the bottom turbo is 5" on the exducer side.By necking it down to 4" you will create a restriction which would cause heat issues.
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missed the twins part...
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5 inch it is. Thank You.
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