Exhaust 4 of 5"? - Ford Powerstroke Diesel Forum
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Old 09-18-2012, 06:54 AM
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Exhaust 4 of 5"?

Looking into a tuner, intake and exhaust and noticing that some are using a 5in downpipe back exhaust w/ or w/o a muffler. I would probably go the w/muffler route, but curious if there is much performance difference between a 4 or 5in exhaust.

Thanks!
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Old 09-18-2012, 07:20 AM
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I don't think you will really see a performance advantage considering the HP you will be making. The only thing it is going to do is give it a slightly deeper tone.
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Old 09-18-2012, 08:57 AM
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5" down pipe back no muffler. I had the 4" and then changed to 5". Sounds way better plus lower egt's

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Old 09-18-2012, 09:41 AM
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I have a 4" downpipe to a 5" cat delete muffler delete exhaust and I love it. The only difference between the 4"-5" is the cost and sound difference.
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