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Old 03-05-2013, 06:33 PM   #1
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4" to 5" exhaust.

Has anyone gone from a 4" to 5" exhaust on an ISC. If you have what difference in power and mileage would you expect.
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Old 03-05-2013, 06:40 PM   #2
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The biggest restriction is in the muffler. Mine has the 4" input and 5" output. 5" input might make a small difference but at what point would you make the change? The turbo and exhaust brake are 4" so how would you do that?
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Old 03-05-2013, 08:34 PM   #3
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I seen on another forum where they adapted up after the exhaust brake. There was a lack of info and it was an old thread so I couldn't ask. To change turbo to 5 inch would be expensive and also tricky as I understand there are issues with the turbo not spooling up the same and creating heat. I have seen on Ford and Chev diesels where they have gone to 5" and achieved some power.
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