Chevy and GMC Duramax Diesel Forum - View Single Post - MBRP Exhaust
Thread: MBRP Exhaust
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post #4 of (permalink) Old 12-03-2019, 10:26 AM
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Originally Posted by Herk537 View Post
What is the big difference between the 4" and 5" besides the size.
Literally just the amount of air that flows through it, might make it louder with a 5” also. No real performance gain between a 4” and 5”, just personal preference really.
Although some do say 4” for performance and 5” for sound.
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