Stock, 4", ?or 5" W/ DPF/DOC Delete? - Ford Powerstroke Diesel Forum
6.4L Performance Parts Discussion What has or has not worked for you?

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post #1 of 7 Old 01-23-2010, 02:30 PM Thread Starter
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Stock, 4", ?or 5" W/ DPF/DOC Delete?

So I done my taxes today and woo hoo! I'm getting a refund! That means I can get the things I want for the truck in two weeks when the money gets here. I am going to go with the Black Max tuner and was wondering what you guys recommend as far as size for the DPF/DOC delete pipes? Should I keep my stock 3.5" or go bigger on my exhaust. I had a friend with a 6.0 with stock exhaust that was straight piped and I wasn't crazy about the hair dryer sound. I'd like for my truck to be as loud as possible with the least amount of hair dryer noise. Please let me know your opinions.

2015 Lariat F350 FX4 CC/LB SRW 3.55's Ignot Silver Zone 4" Lift Nitto Trail Grapplers 295x65x20 UWS ToolBox
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post #2 of 7 Old 01-23-2010, 02:57 PM
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We have a great option that is a 4" pipe that the last few inches reduces down to 3.5" to fit stock or any aftermarket DPF back exhaust system. This allows you to later cut off the 3.5" end and go up to a full 4" exhaust. If your going to change the rear section of your exhaust, then we build 4 and 5" pipes for each of the aftermarket exhaust. Question would be if you want to change the factory muffler/tailpipe now or not. You are going to get some of the "hair dryer" noise with any CAT/DPF delete when running the stock muffler(not really much of a muffler). It is as bad as the 6.0's but still there. The aftermarket exhaust systems with a real muffler seem to remove much of that noise. I've had good luck with both the Magnaflow and the MBRP DPF back systems for this, be careful as both these company's have systems with or without mufflers.

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post #3 of 7 Old 01-23-2010, 03:12 PM Thread Starter
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I was thinking of running a full straight pipe, no muffler weather it be the stock or 4" or 5" Down pipe back. If I ran the DPF/DOC that you have that connects to the stock exhaust and then removing my muffler and running like a 5" tip, would that sound good? Or would I be much better off running a 4" downpipe back with an aftermarket muffler and a 5" tip?

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post #4 of 7 Old 01-23-2010, 05:14 PM
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I would recommend the AFE system. I got the 4" stainless without the muffler and it came with a 5" tip. Really nice setup and easy to install. It does sound like a jet if you're outside the cab, but you can't really hear it inside. Sounds good when driving imho.

Oh yea, get it from Sean above or Aaron at Rudys. SUPER FAST shipping! and great customer service.

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post #5 of 7 Old 01-24-2010, 08:48 AM
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I put the downpipe back 5" straight pipe system under my truck. Actually sounds pretty damn good. Really deep tone but it's not loud in the cab. Does get that hair dryer sound at an idle, but under throttle it sounds more like a big block gasser, good grunt to it.


PS- You'll like that Black Maxx, very happy with mine.

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post #6 of 7 Old 01-24-2010, 10:58 AM
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I highly recommend the AFE exhaust options. They are amazing quality and an easy install! Let me know if I can help

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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 #7 of 7 Old 01-24-2010, 12:43 PM
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I went with the H&S DPF/DOC delete pipe. The fit and finish are great IMO. I wish I would have went with a 4" DBE though. I think I'm going to just buy a MBRP filter back exhaust to finish it off. You are going to love the Black Maxx also. My trans shifts awsome and I was happy with my dyno results also.

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