Exhuast/intake upgrades
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Logistics Pro
Joined: Mar 2007
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From: Claremore, OK
Exhuast/intake upgrades
Reading in the current issue of "Diesel Power" there is an artical about installing a Diamond Eye exhaust and Volant intake on a '04 PSD CC FX4. The artical claims they improved the fuel milage 1.2 MPG on the highway over stock; and 0.9 while towing. I'll be the first to admit I'm confused...one group of folks on here says don't waits your time with a new intake...while a few say it breaths better after swaping to an aftermarket. I'm looking for some experinced opinions here...which means you've installed it and have the numbers to back up the increased/unchanged fuel milage. I'm not trying to get my '04 into the same milage range as a Jetta, ain't going to happen. But on the same token fuel ain't getting any cheaper and minor upgrades here an there do help make one's truck stand out in the crowd.
Cargo Master
Joined: May 2002
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From: Gulf Coast, FL
The COST alone for the intake systems don't make the gains worth anything. The OEM intake is GREAT for power to 500 HP, so why threaten your turbo warranty with the potential of dusting?
The exhaust will not help too much since the primary use is to drop EGTs. There is a feeling of power loss since the power band moves higher up the RPM band.
I run the ZOODAD mod, with my own modded OEM intake, an Accufab Power elbow while using a 3.5" straight piped exhaust. I have NO complaints with my setup and would recommend this approach unless you are going BIG on everything in the future.
The exhaust will not help too much since the primary use is to drop EGTs. There is a feeling of power loss since the power band moves higher up the RPM band.
I run the ZOODAD mod, with my own modded OEM intake, an Accufab Power elbow while using a 3.5" straight piped exhaust. I have NO complaints with my setup and would recommend this approach unless you are going BIG on everything in the future.
Senior User
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Originally Posted by HeavyAssault
I run the ZOODAD mod, with my own modded OEM intake, an Accufab Power elbow while using a 3.5" straight piped exhaust. I have NO complaints with my setup and would recommend this approach unless you are going BIG on everything in the future.
Cargo Master
Joined: May 2002
Posts: 3,271
Likes: 229
From: Gulf Coast, FL
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Logistics Pro
Joined: Mar 2007
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From: Claremore, OK
I've looked at the intake several times between the filter box and grill and wondered if that opening in behind the grill could be opened up to increase the "ram air" effect as the truck is rolling down the highway. I figured the effects wouldn't be noticed below 40-50 mph...but since I spend most of my time in the 60-75 range every bit helps when your trying to be more efficent and take advantage of the pressure against the front of the truck.
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Junior User
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From: Rhode Island
Originally Posted by HeavyAssault
I run the ZOODAD mod, with my own modded OEM intake, an Accufab Power elbow
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Cargo Master
Joined: May 2002
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From: Gulf Coast, FL
EGTs should be lower, the Accufab may give you a seat of pants difference.
Do each mod one at a time and LISTEN to the motor. Listen to the turbo these things will tell you what is going on,
Do each mod one at a time and LISTEN to the motor. Listen to the turbo these things will tell you what is going on,
Senior User
Joined: Nov 2007
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Originally Posted by HeavyAssault
I cut the long snorkle portion off the front of the OEM intake. Increasing the open area QUITE a bit to the filter; instead of a soda straw it's a fire hose now.
Junior User
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From: Rhode Island
One at a time sounds good, but first has to be gauges. I really want a baseline. I still have the EGR and throttle plate hooked up although I believe it was taken out of the program over a year ago.
Posting Guru
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From: NorCal
The zoodad mod is where you cut an opening next to the radiator that will let air flow more directly into the snorkel for the airbox, you don't cut the airbox.
Do a search for "Zoodad mod" and you will find alot of posts about it.
Do a search for "Zoodad mod" and you will find alot of posts about it.
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Logistics Pro
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From: Claremore, OK
So from reading one of the ZOODAD threads...the hole that is to the right (driver's side) of the main radiator opening...is enlarged? My '04 has a 2"-2.5" round hole there now. I'm just trying to understand what exactly is such a big deal about the ZOODAD mod. I run a "pavement princess" as it is...so I don't forsee a plunge into a mud hole for as long as I own the truck (I have other toys that are for the mud). Though driving during a monsoon, it would make me wonder if the air filter will remain dry.
Last edited by zhilton; Jan 3, 2008 at 09:35 PM.