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MBRP or Diamond Eye

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Discussion Starter · #1 ·
2006 F350 CC DRW 8ft bed
Primarily tow ~11000lb fifth wheel (2011 Laredo 321BH)

The beast has popped the weld on the original to us exhaust and is in need of replacing. This is a workhorse and definitely not going to win any shows so I'm trying to keep it cost-efficient ($300-$450 max). Both MBRP and Diamond Eye offer comparably priced turbo back systems and I'm wondering what real-world advice can be given.

I found a few videos of idle and light acceleration but there isn't a lot out there for loaded heavy tones. And we have the towboss with the 4.30 gears so we run high RPM.

The old system had a muffler but I'm not really sure what system it is to compare. I'll try to look at the muffler tomorrow for a name.

I'm confident I don't need the 5" exhaust since I'm "oem+" and not racing it. Do the high flow mufflers make much difference?
I'm debating 4" turbo back straight pipe with muffler vs without.
Performance-wise:
- EGTs, I'm thinking there won't be much change with or without the muffler going to the 4"
- Maybe a little more power with the larger downpipe,even if it's 3.5" I've seen some listed at.

While I like the dump pipe sounds with extra bark and whistles under the cab, I'm curious how much it would change if I straight pipped it out the back. Will the rare family conversation still be an issue? Or, the exhaust drone when cruising loaded at 2100-2500 RPM (65-70MPH).


Here's the pair for reference:
769858
 

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Mr. Crossthread
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A full exhaust will quiet it down a lot in the cab. I prefer MBRP over Diamond Eye, but that's only personal preference due to having used them so many times.

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Discussion Starter · #3 ·
A full exhaust will quiet it down a lot in the cab. I prefer MBRP over Diamond Eye, but that's only personal preference due to having used them so many times.

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Thanks. I should have started it with a poll. I added it and notched 1 for you :)

Which MBRP did you run?

Here's the ones I was looking at:
MBRP
Straight- MBRP 2003-2007 Ford F-250/350 6.0L 4'' Turbo Back, Single Side Off-Road - no muffler -- S6212PLM
Muffled- MBRP 2003-2007 Ford F-250/350 6.0L 4'' Turbo Back, Single Side Off-Road -- S6212P

Diamond Eye
Have to select options- Exhaust Systems | 2003-2007 Ford Powerstroke | Diamond Eye | Thoroughbred Diesel
 

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Mr. Crossthread
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Straight pipe full exhaust for a few years then cut it into an axle dump.

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The biggest between the two is;
Diamond Eye has a 4" down pipe, mbrp down pipe is actually 3.5".
I have the Diamond Eye 4"straight pipe.i was contiplating a muffler, but after I heard it, I said forget it. It sounds tough, but doesn't kill you in the cab.... Roll the windows down going by a fence though .
You can beat the price of the site listed by a few $$, if you want to shop around.
I had a buddy help me put mine in, which I'd recommend, but it's not really necessary. We did fit, cut, fit, remove and then fit again. Then I clamped everything down (welding would be better, of course).
I do run a tuner and I think after the install, the stick tune feels a little laggy, but it could be because I've been running a tune for so long (I rarely run the stock tune and never more than a day).
What ever you do, you'll like it. Go stainless in the rust belt, otherwise aluminized steel is just fine.
 

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The biggest between the two is;
Diamond Eye has a 4" down pipe, mbrp down pipe is actually 3.5".
I have the Diamond Eye 4"straight pipe.i was contiplating a muffler, but after I heard it, I said forget it. It sounds tough, but doesn't kill you in the cab.... Roll the windows down going by a fence though .
You can beat the price of the site listed by a few $$, if you want to shop around.
I had a buddy help me put mine in, which I'd recommend, but it's not really necessary. We did fit, cut, fit, remove and then fit again. Then I clamped everything down (welding would be better, of course).
I do run a tuner and I think after the install, the stick tune feels a little laggy, but it could be because I've been running a tune for so long (I rarely run the stock tune and never more than a day).
What ever you do, you'll like it. Go stainless in the rust belt, otherwise aluminized steel is just fine.
 

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I have the 4" MBRP system I picked up on eBay for $300. It's been on for about 9 months now. No complaints here.


Sound is great.

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