4" exhaust with muffler=stock quiet, intake noise thoughts. - Ford Powerstroke Diesel Forum
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Old 04-25-2011, 11:52 AM
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4" exhaust with muffler=stock quiet, intake noise thoughts.

I installed my new 4" exhaust, downpipe back with a muffler, this weekend and took her out in the hills for some fun. Other than the DPF/CAT being removed I cant even hear a difference in the sound. So if anyone is looking to get a less noticeable set-up, this may be your key .Comments... Also what intakes seem to be the loudest and which ones seem to be quieter? Need more flow now...
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Old 04-25-2011, 04:13 PM
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I had a straight 4" before this weekend, put a muffler in it.
I loved the sound with the straight pipe, but it was LOUD on the outside. Inside was fine. I started to get looks from Johnny Law pulling my trailer through town. With the muffler I can still hear it inside, outside it is not as loud.
I put in the Diamond Eye muffler that is perforated and packed.
Intake - I just used a drop in, but I am sure anyone of them with an open top would be the loudest. I can hear mine more with just the drop in.
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Old 04-25-2011, 04:30 PM
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And I am running the mild tunes. The less smoke I make = less attention I attract while the goodies are installed.
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Old 04-25-2011, 05:38 PM
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I am running the Innovative Street right now, might see how it does towing 18000# and check the temps. Might be too hot to run with 105 degrees outside. The tow tune so far has been great.
Before I put a muffler on the truck I had the Xtreme Street driving back from Bakersfield. A CHP was next to me and kept looking at the truck, more so when I took off. That is when I decided on a muffler. At least they wont notice the sound as much.
My 96 Impala gets enough attention, Dual 3" will do that.
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Old 04-25-2011, 06:36 PM
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Most CHP here wouldnt know what to look for anyways. Another benefit of actually having a muffler is at a quick glance, everything looks legit. I had window tint on the front windows too, but I have since took to off. ANYTHING I can do to not draw attention and get mileage is my goal ! (Im up by fresno)
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Old 04-26-2011, 09:21 AM
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They might not know what to look for but they do have ears and my truck was loud without a load and really load with a load. I went to high school and college in Fresno.
Actually come up pretty often.
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Old 04-26-2011, 03:23 PM
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The muffler helps out a lot with that ! You ever worry think twice about running your deletes here? I have been driving like a granny to mileage and not make smoke when ANYONE is around...lol
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Old 04-26-2011, 03:59 PM
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Do you guys have any random check points you have to go through down in Central or Southern Cal? I live in Northern Nevada, but drive though Northern Cal quite frequently. Im always seeing CHP but never check points. I know they are pretty aggressive up here for speeders and such, not so much on Diesels unless they are cranking the smoke out. Probably a Southern California issue mainly with the smog and the bigger cities...
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Old 04-26-2011, 11:13 PM
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Not that I know of. I travel often between central Ca and the Carson area. I wouldnt run the hot tune through any of the passes though. I know they have weigh stations and the occasional DUI checkpoints. Just be smart about it you will be fine.
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Old 04-27-2011, 05:18 AM
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I have never seen one. But I do live near the Oil Fields. I have been told that some are down south, but the same, never seen one.
I am not afraid of the delete, the noise. The smoke is one thing, but doing it with a bunch of noise towing a trailer is not a good idea with the way the economy is. I wouldnt have a delete if it wasnt better for the truck and MPG. My 6.0 was deleted also. But it makes a much bigger difference on the 6.4's.
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