Why put exhaust on a 6.4L? - Ford Powerstroke Diesel Forum
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Old 08-22-2013, 12:35 PM
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Why put exhaust on a 6.4L?

So being new to the 6.4, I've been searching and learning a ton of information about these trucks. My H&S race tuner is on order and should be here next week. I plan to delete the EGR and DPF shortly after it arrives.
In looking at exhaust options a couple questions occur to me.

Why are DPF delete pipes so expensive? Is there something special about this section of tubing that will replace the DPP?

Also, if the down pipe and exhaust are 4", why replace with an aftermarket 4"? I understand that some folks like the sound with no muffler and others like the growl from a 5" pipe. But is there a performance reason to replace the stock exhaust with an aftermarket 4" If i tune my truck and put CAI on it, is 4" adequate?

I've searched and I haven't seen these questions addressed yet.

Thanks in advance
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Old 08-22-2013, 12:54 PM
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The down pipe I cut off my truck wasn't 4"and when I installed my exhaust my truck came alive. I didn't buy a dpf delete pipe by itself so I have no input on the price but I did see them in the classified on here for like 100 bucks.

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Old 08-22-2013, 12:58 PM
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You can get away with a 4" exhaust, the difference between 4" and 5" is pretty much just tone, and and as far as changing the 4" down pipe people do it because the factory dp is double walled and restrictive.
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Old 08-22-2013, 01:59 PM
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The factory downpipe is restrictive because of a crimp if I remember and after the DPF somewhere in the muffler section the pipe goes down to 3 inches. I can't remember exactly, but the stock exhaust is restrictive compared to aftermarket.
Is the tuner you ordered a "race" tuner?
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Old 08-22-2013, 03:44 PM
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Thanks for the replies. I'll have to look at my stock exhaust and see if I can identify where it restricts down to 3" after the DPF. Is replacing the downpipe worth the cost and effort? It sounds like a major pain to do.

Flashover1969 - Yes, I ordered an H&S Mini Maxx that was advertised on Parley's Diesel as being a race unit capable of deleting the EGR and DPF. It better be a race unit since the cost was $1500!
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Old 08-22-2013, 04:43 PM
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Quote:
Originally Posted by wellsit View Post
Thanks for the replies. I'll have to look at my stock exhaust and see if I can identify where it restricts down to 3" after the DPF. Is replacing the downpipe worth the cost and effort? It sounds like a major pain to do.
The downpipe is before the DPF. It runs from the turbo to the underside of the truck.

I have never seen an official comparison between a turbo-back and downpipe-back system in terms of replacing the stocker with a 4" downpipe. I went the route of the downpipe back and I'm not looking back...
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Old 08-22-2013, 05:25 PM
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Quote:
Originally Posted by wellsit View Post
Thanks for the replies. I'll have to look at my stock exhaust and see if I can identify where it restricts down to 3" after the DPF. Is replacing the downpipe worth the cost and effort? It sounds like a major pain to do.

Flashover1969 - Yes, I ordered an H&S Mini Maxx that was advertised on Parley's Diesel as being a race unit capable of deleting the EGR and DPF. It better be a race unit since the cost was $1500!
It's not to bad you just have to cut the factory dp with a sawzall, and when you see what it looks like cut in half then you'll see why it would be a good idea to change it. The hardest part was lining up the top piece of the 2 piece after market dp to the turbo and putting the clamp on IMO gl.
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Old 08-22-2013, 08:37 PM
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So is putting an aftermarket down pipe a relatively easy job? Aside from being annoying to line things up, is it very difficult to get the 2 piece unit in and connected?

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Old 08-22-2013, 08:48 PM
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Originally Posted by wellsit View Post
So is putting an aftermarket down pipe a relatively easy job? Aside from being annoying to line things up, is it very difficult to get the 2 piece unit in and connected?

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As long as you cut the right amount off of the right pieces... Easy job.
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Old 08-23-2013, 07:40 AM
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I went with the MBRP DP and the directions made it pretty easy. Taking your time and stopping for beer brakes it only takes about a hour. Don't forget to wrap it. Certainly better throttle response IMO.

Last edited by XPLOSIV; 08-23-2013 at 07:40 AM. Reason: wrong dp
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