Stock, 4", ?or 5" W/ DPF/DOC Delete? - Ford Powerstroke Diesel Forum
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Old 01-23-2010, 02:30 PM
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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.
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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.

Last edited by powerstroker67; 01-23-2010 at 03:01 PM.
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Old 01-23-2010, 03:12 PM
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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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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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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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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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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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