5 inch exhaust
5th Wheeling
Joined: Aug 2004
Posts: 38
Likes: 0
From: Central Kentucky
Exhaust system
I have been considering an exhaust upgrade on my '05 PS, but am hesitant to do so because of the exhaust back pressure sensor used on the fuel mgmt. system of these trucks. When you install a free flowing exhaust it would be logical that you would also lower your backpressure. What affect would this have on the computer control of the turbo system ? If the sensor did not see the pressure it is calibrated for, how could it give valid info to the computer ?
You know the old saying "junk in/junk out. Essentially wouldn't this make the computer give false commands to the VGT valve that controls the vanes in the turbo? David.
You know the old saying "junk in/junk out. Essentially wouldn't this make the computer give false commands to the VGT valve that controls the vanes in the turbo? David.
Posting Guru
Joined: Jan 2004
Posts: 1,539
Likes: 1
From: Snohomish, Washington
Originally Posted by f250meangreen
I have seen where you have to install a 5 inch exhaust after installing a tuner to keep the egt's down. Is it cat. back of turbo back and where do I find it?
Thanks,
Jayme
Thanks,
Jayme
Former Vendor
Joined: Mar 2004
Posts: 4,362
Likes: 3
From: Hendersonville, NC
Originally Posted by 04superduty
Yeesh tim i hope your flame suit is up to date with a comment about a v 10's milege. 
A little gas-fueled fire is NOTHING
Trending Topics
FTE Leadership Emeritus
Joined: Jan 2003
Posts: 161,999
Likes: 75
From: 3rd Rock
Well no disrespect to the v-10 guys, I was one for three years...love the truck, however it never got any good MPG...If I was a rich man. I would lower an X lots of tire on it huge breaks, v-10 and go road racing...I did a number of laps with mine on a road course, has a bit of a push when you get it in real deep...but fun, did I mention I would pull it to the track with my 6.0
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Senior User
Joined: Jul 2004
Posts: 156
Likes: 0
From: Dallas, Texas
Ben, a question for you
Ben,
Should I assume that a 4" Cat back would be the way to go? I am still debating which way to do the deal, and it seems the 4" down pipe really doesn't seem to be a benefit prior to the Cat because we need a certain amount of back pressure, but from the Cat is where the larger exhaust benefits are gained in EGT temperature drop and MPG gains.
These are just my observations only over a LOT of reading in the past year with my 6.0 and discussions with friends and fellow owners.
I will keep watching this thread with interest.
John Russell
Should I assume that a 4" Cat back would be the way to go? I am still debating which way to do the deal, and it seems the 4" down pipe really doesn't seem to be a benefit prior to the Cat because we need a certain amount of back pressure, but from the Cat is where the larger exhaust benefits are gained in EGT temperature drop and MPG gains.
These are just my observations only over a LOT of reading in the past year with my 6.0 and discussions with friends and fellow owners.
I will keep watching this thread with interest.
John Russell
Posting Guru
Joined: Jan 2004
Posts: 1,539
Likes: 1
From: Snohomish, Washington
Originally Posted by John Russell
Ben,
Should I assume that a 4" Cat back would be the way to go? I am still debating which way to do the deal, and it seems the 4" down pipe really doesn't seem to be a benefit prior to the Cat because we need a certain amount of back pressure, but from the Cat is where the larger exhaust benefits are gained in EGT temperature drop and MPG gains.
These are just my observations only over a LOT of reading in the past year with my 6.0 and discussions with friends and fellow owners.
I will keep watching this thread with interest.
John Russell
Should I assume that a 4" Cat back would be the way to go? I am still debating which way to do the deal, and it seems the 4" down pipe really doesn't seem to be a benefit prior to the Cat because we need a certain amount of back pressure, but from the Cat is where the larger exhaust benefits are gained in EGT temperature drop and MPG gains.
These are just my observations only over a LOT of reading in the past year with my 6.0 and discussions with friends and fellow owners.
I will keep watching this thread with interest.
John Russell
Senior User
Joined: Jul 2004
Posts: 156
Likes: 0
From: Dallas, Texas
Ben,
My plan is to do a Cat back system, replacing everything from there back. I have been in a friends 2004 F250 with a turbo back system without the Cat or muffler(a Bully Dog). It was surprisingly quiet at idle, just a more noticable turbo whistle, but I didn't much care for the sound once he really hit it. It did seem to spool up quicker, but my taste would tend toward using the kit supplied muffler. I have a suspicion the noise on the highway would get bothersome.
John R.
ps. I am not against Loud- I have a 1966 427 Superformance Cobra replica, but I do like a "quality" sound. There is a difference.
My plan is to do a Cat back system, replacing everything from there back. I have been in a friends 2004 F250 with a turbo back system without the Cat or muffler(a Bully Dog). It was surprisingly quiet at idle, just a more noticable turbo whistle, but I didn't much care for the sound once he really hit it. It did seem to spool up quicker, but my taste would tend toward using the kit supplied muffler. I have a suspicion the noise on the highway would get bothersome.
John R.
ps. I am not against Loud- I have a 1966 427 Superformance Cobra replica, but I do like a "quality" sound. There is a difference.
Senior User
Joined: Apr 2004
Posts: 365
Likes: 0
From: Bay Area, CA
I asked the custom exhaust man in my area about this issue, as I wanted the 5" also, he stated that he doesnt recomend removing the cat because of the sensor??? So it would be pointless to do a turbo back with the cat still inline.....I dunno what Im gonna do.....so many questions, so many different answers....I might just throw my hands in the air, and just leave everything stock......without the frustrations, I might just add a few years to my life!!!LOL
Postmaster
Joined: Aug 2003
Posts: 4,483
Likes: 2
From: Central Texas
Originally Posted by s2gots
I asked the custom exhaust man in my area about this issue, as I wanted the 5" also, he stated that he doesnt recomend removing the cat because of the sensor??? So it would be pointless to do a turbo back with the cat still inline.....I dunno what Im gonna do.....so many questions, so many different answers....I might just throw my hands in the air, and just leave everything stock......without the frustrations, I might just add a few years to my life!!!LOL