6.4l Turn Down exhaust - Ford Powerstroke Diesel Forum
6.4L Performance Parts Discussion What has or has not worked for you?

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post #1 of 12 Old 09-25-2012, 06:40 PM Thread Starter
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6.4l Turn Down exhaust

Hey i have been thinking about instead of just doing the traditional 5 Inch exhaust to do a 5inch and cut it midway through the bed or where it would work and put a turn down tip on it. Would this make it louder and has anybody else done it thanks
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post #2 of 12 Old 09-25-2012, 07:58 PM
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I ran my 5" dumping over the axle for awhile. It got old after a few weeks. I assume the setup your talking about would get old after a few days. I'm back running mine the "traditional" way.

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post #3 of 12 Old 09-25-2012, 08:11 PM
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Not saying it wouldn't but why does it get old? And did it sound different?

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post #4 of 12 Old 09-25-2012, 08:23 PM
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I want the 4'' turn down right after the axle. I would like to know pros and cons too?

2008 F350 Crew Cab DRW; H&S Mini Maxx; S&B intake; 4 inch straight pipe. 130000 Miles on the clock.
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post #5 of 12 Old 09-26-2012, 06:57 AM
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it will make it seem louder. the truck is fairly quiet to begin with so i dont think it will be too bad at all. our 04 dumps before the axle and its not bad and the 6.0 is wayyyy louder than the 6.4.

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post #6 of 12 Old 09-26-2012, 08:01 AM
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I have a 5" that dumps after the axle with a 6" tip on it. Before the tip it got annoying because of how much drone it had. The tip help so much I can't hardly hear it with windows up. This is because of before the exhaust exited too far up and was reverberating under the bed and that transferred to the cab

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post #7 of 12 Old 09-26-2012, 08:05 AM
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2008 F-250 KR
7" ICON
7" PMF blocks
Bilstein 5160F/5100R
22x14 Fuel Octane
37" Toyo M/T
H&S Mini Maxx w/ Gearhead tuning!
5" Diamond Eye
4" Diamond Eye DP
ARP head studs
Custom Stock Intake

RCD converter, HD billet input, low/rev hub, suncoast clutches.
160k miles and counting...
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post #8 of 12 Old 09-26-2012, 11:56 AM
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Wouldn't that just cover the underside of your bed I'm soot? What's the point? Trying to hide the fact you have an exhaust?


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post #9 of 12 Old 09-26-2012, 12:12 PM
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I had drone issues with mine. I don't anymore now that the tail section is back on.

Jeff Dodd
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2012 Ford F-250 Lariat CC/SB

Mods - Spartan tuned via laptop, 4" AFE stainless exhaust system, 2.5" PMF BMC leveling spacers, 3" PMF lift blocks, Fox Racing 2.0 shocks, Recon smoked mirror & cab lights
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post #10 of 12 Old 09-26-2012, 12:18 PM
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Well, I have a Cobra and had turndowns on it (Flowmaster 2-chambers with headers and no-cat H-pipe). It was considerably louder both inside the car and from most points outside the car. Everything in it vibrated (coins, cans, keys, etc.) and the drone was terribly annoying at highway speed (it was in the drone sweetspot at 70-75 MPH). It did sound super bada$$ though.

I lived like this for 4 years. I had tailpipes put on and immediately the car was quieter (unless you were directly behind it).

It gets old because eventually you get tired of the drone or having to yell at the person sitting in the car/truck with you just to carry on a conversation. On long trips, the sound alone can wear you out. It attracts attention at the wrong times too (you people with tuners and a heavy right foot know what I mean).

With a proper muffler, this could possibly be sorted out. I'd avoid chambered muffler designs. If you must do it and don't want to deal with the loud constant noise, get a quiet muffler and it'll still be louder than if you had it coming out of the tailpipe the normal way.


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Last edited by Doss; 09-26-2012 at 12:21 PM. Reason: cleaned up
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