4" or 5" Exhaust? - Ford Powerstroke Diesel Forum
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post #1 of 15 Old 06-12-2010, 04:48 AM Thread Starter
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4" or 5" Exhaust?

Is there an advantage between 4" vs. 5" exhaust or is it just sound difference? I am looking to order an exhaust system and the price difference is only like $30. I am currently running stock exhaust on my 02' F-350. Thanks!
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post #2 of 15 Old 06-12-2010, 06:21 AM
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4 inch is good all around. but 5 inch gives you a deeper sound. I have a 6.4, I had a 4 inch and went to 5 just for sound. Its really upto you buddy.

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post #3 of 15 Old 06-15-2010, 10:54 AM
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Performance will be the same, but the 5" will have a deeper tone to it.



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post #4 of 15 Old 06-15-2010, 09:37 PM
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5" ! the deep sound is nice

05+ coils, 10 Rear diff, box, tailgate, lights, bumper, Full 07 front harley swap...the list is endless.

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post #5 of 15 Old 06-16-2010, 02:17 AM Thread Starter
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I ended up buying a 4" Hog Performance, should be here Friday. They say it's not hard to change and this is my first diesel so I guess we will see.
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post #6 of 15 Old 06-17-2010, 01:16 PM
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Well... either way, you should definitely go with a 6" tip!
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post #7 of 15 Old 06-18-2010, 07:15 PM Thread Starter
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Got the exhaust in the mail today and put on tonight. Sounds great! I put the muffler on backwards (on purpose) and I think it sounds sweet. I will be curious to see if it gets me any better MPG after I am done playing with it. I put on the DIY intake last week and checked by fuel mileage tonight when I filled up before doing the exhaust and I am getting 19.5 MPG with mixed city driving and driving to work (24 miles a day round trip). I get my SCT chip installed this weekend as well so I am pumped about that!
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post #8 of 15 Old 06-19-2010, 09:50 AM
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Wow... 19.5 MPG is great! Especially with mixed city/hwy driving. I'm hoping for high teens in the city, and mid 20s on the hwy when I get mine complete. I would be super happy with that! Congrats on the exhaust install! Can't wait to get mine in...
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post #9 of 15 Old 06-19-2010, 05:18 PM
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I just installed my 4" diamond eye exhaust today, it fit good and sounds ok, not much difference than my factory exhaust with just the muffler cut off but my egt's seem to not climb as bad and the truck cools down quicker which I'm sure is because of the bigger down pipe

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post #10 of 15 Old 06-20-2010, 05:04 AM
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Quote:
Originally Posted by Lowdown89 View Post
I just installed my 4" diamond eye exhaust today, it fit good and sounds ok, not much difference than my factory exhaust with just the muffler cut off but my egt's seem to not climb as bad and the truck cools down quicker which I'm sure is because of the bigger down pipe
I got a question for ya! And this is something I've been pondering for a while. I really want to get my ISSPRO gauges and install them on my A-pillar, however I don't want to have to "install" the pyrometer twice. When you installed your pyrometer, did you tap it into your factory exhaust--and then tap it into your diamond eye exhaust once that was installed?

I'm planning on getting my MBRP exhaust before my gauges, simply because I don't want to have to do the "same work" twice. Thanks!
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