exhaust
Former Vendor
Joined: Mar 2004
Posts: 4,362
Likes: 3
From: Hendersonville, NC
Originally Posted by SBV45
My point precisely. Maximum performance. Don't overspool that turbo though! Plus performance shops are in the business of selling product and would love to sell you another turbo.
Postmaster
Joined: Aug 2003
Posts: 4,483
Likes: 2
From: Central Texas
Originally Posted by SBV45
... But go to the 6.0 Bilble. There is an EBP sensor (exhaust back pressure). If there is no back pressure, the vgt valve will close the vanes to create higher speed on the turbo. If you increase the diameter of the exhaust, you lose some back pressure. Won't the loss of back pressure cause the turbo vanes to stay closed too long resulting in turbo overspeeds? Is this the cause of the louder turbo noise? Is there a down side to a big exhaust?......
....Appropriate back pressure seems to play a big role in the tuning of this engine...
....Appropriate back pressure seems to play a big role in the tuning of this engine...
coogan1 flat rate tech is here http://6literpowerstroke.flatratetech.com/. It is a site of techs. They have a forum and all sorts of good info.
Senior User
Joined: Jul 2004
Posts: 156
Likes: 0
From: Dallas, Texas
Interesting thread!
Wow! Lots of good information here, and it appears a cat-back application is in the near future for me. Now, I guess the serious product searching starts.
I'm glad I found this web site, and thanks to all that post their opinions, experience- both good and bad- and the sponsors.
This 6.0 really has been a good choice for me so far, with about 15,500 miles and no problems yet. I guess this is the American way, always looking for " a little more".
John Russell
I'm glad I found this web site, and thanks to all that post their opinions, experience- both good and bad- and the sponsors.
This 6.0 really has been a good choice for me so far, with about 15,500 miles and no problems yet. I guess this is the American way, always looking for " a little more".
John Russell
Postmaster
Joined: Aug 2003
Posts: 4,483
Likes: 2
From: Central Texas
John Russell, Welcome to the FTE. Good bunch here and a good source of knowledge. If you have 15K miles you have some experience with the truck. Anything you learn, you can share here.
Keep in mind, my theory on the exhaust is theory. I have documentation that has lead me to that theory. I don't have a lab to prove it out, but it is worth thinking about. In the performance circles, there is plenty of study on "tuned exhaust". I don't see why that doesn't apply here.
Keep in mind, my theory on the exhaust is theory. I have documentation that has lead me to that theory. I don't have a lab to prove it out, but it is worth thinking about. In the performance circles, there is plenty of study on "tuned exhaust". I don't see why that doesn't apply here.
FTE Leadership Emeritus
Joined: Jan 2003
Posts: 161,999
Likes: 75
From: 3rd Rock
Originally Posted by PSD 60L Fx4
Too late
My point precisely. Maximum performance. Don't overspool that turbo though! Plus performance shops are in the business of selling product and would love to sell you another turbo.
Too late
No fewer words.... have ever said so much
Senior User
Joined: Apr 2003
Posts: 100
Likes: 0
From: Calgary,Canada
Just a quik note- my local diesel performance shop here in Calgary swears by the cat back systems for the 6.0. The 04 motors do not have a squished downpipe, it is a smooth flowing job and my shop here says anything more than a good catback on the 6.0 is a waste of money. Also mentioned that the catback "lowers egt's in the neighborhood of 200 degrees".
I have no idea if this is true, but they do several per week and seem to be straight up guys. I think I will go this route, seems logical with warrentee stickiness and all.
I have no idea if this is true, but they do several per week and seem to be straight up guys. I think I will go this route, seems logical with warrentee stickiness and all.
Post Fiend
Joined: Oct 2002
Posts: 11,314
Likes: 4
The cat back (or really the elimination of the HUGE stock muffler) will lower egts, but the turbo back will lower it even further....
I think I recall that the cat back gives you about 70% of the benefit of the turbo back with good smooth bends...
I think I recall that the cat back gives you about 70% of the benefit of the turbo back with good smooth bends...
Posting Guru
Joined: May 2004
Posts: 1,414
Likes: 0
From: stoneboro, pa
the cat back is only .5 inch larger pipe, and the stock is already fairly smooth tho.
i bet the 200deg drop is just from the removal of the muffler.....IMO
i have been told by many and my opinion is also: the DP on an 03 is the only real restriction, other than the muffler, in the exhaust. but i am also quite cheap
so i dont wanna shell out the bucks for a "only slightly better" exhaust.
especially when i could buy a 4" DP, put on a 4-5" adapter and a piece of 5" pipe that Y's into two 5"stacks!!! and have 250 bucks in it, plus 50 to have it all put on
anybody thinkin of stacks? www.grpipes.com is awesome for exhaust systems for BIG trucks. and they install 'em. theyre in cleveland OH
i bet the 200deg drop is just from the removal of the muffler.....IMO
i have been told by many and my opinion is also: the DP on an 03 is the only real restriction, other than the muffler, in the exhaust. but i am also quite cheap
so i dont wanna shell out the bucks for a "only slightly better" exhaust.especially when i could buy a 4" DP, put on a 4-5" adapter and a piece of 5" pipe that Y's into two 5"stacks!!! and have 250 bucks in it, plus 50 to have it all put on
anybody thinkin of stacks? www.grpipes.com is awesome for exhaust systems for BIG trucks. and they install 'em. theyre in cleveland OH
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Brett Foote
FTE Leadership Emeritus
Joined: Jan 2003
Posts: 161,999
Likes: 75
From: 3rd Rock
Originally Posted by bighoss550
the cat back is only .5 inch larger pipe, and the stock is already fairly smooth tho.
i bet the 200deg drop is just from the removal of the muffler.....IMO
i have been told by many and my opinion is also: the DP on an 03 is the only real restriction, other than the muffler, in the exhaust. but i am also quite cheap so i dont wanna shell out the bucks for a "only slightly better" exhaust.
especially when i could buy a 4" DP, put on a 4-5" adapter and a piece of 5" pipe that Y's into two 5"stacks!!! and have 250 bucks in it, plus 50 to have it all put on
anybody thinkin of stacks? www.grpipes.com is awesome for exhaust systems for BIG trucks. and they install 'em. theyre in cleveland OH
i bet the 200deg drop is just from the removal of the muffler.....IMO
i have been told by many and my opinion is also: the DP on an 03 is the only real restriction, other than the muffler, in the exhaust. but i am also quite cheap
so i dont wanna shell out the bucks for a "only slightly better" exhaust.especially when i could buy a 4" DP, put on a 4-5" adapter and a piece of 5" pipe that Y's into two 5"stacks!!! and have 250 bucks in it, plus 50 to have it all put on
anybody thinkin of stacks? www.grpipes.com is awesome for exhaust systems for BIG trucks. and they install 'em. theyre in cleveland OH
Check you email
Posting Guru
Joined: May 2004
Posts: 1,414
Likes: 0
From: stoneboro, pa
Originally Posted by King Ranch
My truck only had a 3" exhaust on it,New one is 4"
FTE Leadership Emeritus
Joined: Jan 2003
Posts: 161,999
Likes: 75
From: 3rd Rock
Originally Posted by bighoss550
its 3 1/2" unless they made one special. they all are 3.5 in the dealer lot....i looked to see if my truck got a bigger one, but no
Senior User
Joined: Jul 2004
Posts: 410
Likes: 0
I have an 03 f-250 6.0 diesel and i had a 4 inch down pipe and exhaust i have no muffler no cat and no ressinator the stock exhaust looked like soup straws when i layed beside each other. It sounds awsome because you can hear the turbo so loud it hurts you hears. Also i have been getting like a exhaust shutter to it at 3000 to 4000 rpm and i have a superchip max microtuner 1704 in to. A new cummins pulled up beside me at a red light and the next stop light was about a mile away and i asked him if he wanted to race and he said yeah but i rather be cummin than strokin and i beat him so bad than he said he wasnt even trying to. and he had a bullydog programmer.