Stock/4"/5" Exhaust Perforamance? - Ford Powerstroke Diesel Forum
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Old 01-14-2011, 04:50 PM
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Stock/4"/5" Exhaust Perforamance?

If doing a dpf/cat delete pipe what are the real performance differences in the different size pipes? What are the gains/benefits from going up in size? The obvious negative is price. And does adding a muffler keep your truck from sounding like a party favor? Thanks for any response.
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Old 01-14-2011, 06:45 PM
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5" with a muffler is going to sound the best (in my opinion). As far as performance goes, I would do at least a 4" downpipe back kit if you plan on running big tunes. If you never plan on running big tunes (and beyond), just a DPF/CAT delete pipe is plenty. If you plan on running your truck hard a lot, I would do a 4" downpipe in to at least a 4" downpipe back exhaust.

Hope this helps!
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Old 01-15-2011, 12:14 PM
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Quote:
Originally Posted by Suthrn View Post
If doing a dpf/cat delete pipe what are the real performance differences in the different size pipes? What are the gains/benefits from going up in size? The obvious negative is price. And does adding a muffler keep your truck from sounding like a party favor? Thanks for any response.
4" is all you really need, 5" is more for sound, looks, and bragging rights. That being said, 5" does sound great on a 6.4L. With or without a muffler is personal preference. Kits with a muffler will get rid of some of the turbo sound (rushing air). If you are just going with the DPF/Cat delete, get the 4". The 5" is more for people who already have a 5" DPF back exhaust.
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Old 01-15-2011, 12:18 PM
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If you like that Turbo/Blow dryer sound or like people looking at your truck with the WTF is in that thing then get the 4" down pipe back with no muffler.
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