Factory 3.5" Exhaust <vs> 4" Stainless Exhaust...cat back only?? - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 59 Old 04-03-2010, 06:42 AM Thread Starter
Powerstroke.org Fanatic
 
Pathfinder22's Avatar
 
Join Date: Dec 2008
Posts: 134
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 2 Post(s)
Feedback Score: 0 reviews
Factory 3.5" Exhaust <vs> 4" Stainless Exhaust...cat back only??

What's the benefit of installing a 4" Stainless Exhaust on my all stock F250, where I am not removing the Cat Conv and I really don't care about performance sound coming out of exhaust???

I assume other than some slight improvement in exhaust flow volume, which may have a slight increase in reduced exhaust temp, there would be no need to shell out the $800 or so for this add-on.

Is this a fair assumption??


'06 F350 Lariat CC DRW 6.0L PSD
Bullet-proofed including Sinister Diesel Coolant Filtration System. Train Horn, Killer Audio w/ back-up cam & subs and Re-upolstered seats...238k and running strong!!

Last edited by Pathfinder22; 04-03-2010 at 07:32 AM. Reason: typo
Pathfinder22 is offline  
post #2 of 59 Old 04-03-2010, 07:26 AM
Powerstroke.org Fanatic
 
cam406406's Avatar
 
Join Date: Feb 2010
Posts: 113
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
ya i am with u i cut cat out and now i am going to cut out muffler for some sound i think it flows plenty
cam406406 is offline  
post #3 of 59 Old 04-03-2010, 07:34 AM Thread Starter
Powerstroke.org Fanatic
 
Pathfinder22's Avatar
 
Join Date: Dec 2008
Posts: 134
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 2 Post(s)
Feedback Score: 0 reviews
Quote:
ya i am with u i cut cat out and now i am going to cut out muffler for some sound i think it flows plenty
What benefits did you get with cutting Cat out? How did you notice those benefits?

Also, are you putting an after-market muffler in or just having straight pipes?

Still wrestling with this one, as I'm all stock and not looking for throaty or performance sound by any means....


'06 F350 Lariat CC DRW 6.0L PSD
Bullet-proofed including Sinister Diesel Coolant Filtration System. Train Horn, Killer Audio w/ back-up cam & subs and Re-upolstered seats...238k and running strong!!
Pathfinder22 is offline  
post #4 of 59 Old 04-03-2010, 07:47 AM
Powerstroke.org Fanatic
 
cam406406's Avatar
 
Join Date: Feb 2010
Posts: 113
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
better mpg with cat gone and am goint to strait pipe it
cam406406 is offline  
post #5 of 59 Old 04-03-2010, 07:49 AM
Compression Ignition Addict
 
smokersteve's Avatar
 
Join Date: Nov 2008
Location: California
Posts: 4,335
Thanks: 0
Thanked 7 Times in 7 Posts
Mentioned: 0 Post(s)
Quoted: 19 Post(s)
Feedback Score: 0 reviews
If you have a 4" turbo back you will lose some low end torque, that is where the mpg is. The truck will have a "throaty or performance sound". It will be loud. People like the 4" for the sound and that it is ment for upgraded turbos and inj.

If you keep the cat on you can even go to a 5" becaue that cat is restictive.

The stock system is 3" down pipe to a 3.5". With a muff and cat delete pipe the truck will gain power and still hold low end touque. This is good for stock or even slightly modified.

With cat and muff delete pipes or any other system, the egt's will drop a good amount and be a benefit to the truck because of the less restrictive system. The remaining factor is low end torque.
smokersteve is offline  
post #6 of 59 Old 04-03-2010, 03:30 PM Thread Starter
Powerstroke.org Fanatic
 
Pathfinder22's Avatar
 
Join Date: Dec 2008
Posts: 134
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 2 Post(s)
Feedback Score: 0 reviews
Quote:
With a muff and cat delete pipe the truck will gain power and still hold low end touque.
Smokersteve;

Thanks, as that's the info I'm looking for. Since I don't care about sound & my system is all stock, I assume there is no need to upgrade to 4" exhaust.

I am very interested in doing the cat & muffler delete, and curious - what will that do to the overall sound?? I don't want it any louder, and if it will be...maybe I should do the cat delete??

Can someone point me to where I can purchase the cat & muff delete pipe?? Gonna go that route.


'06 F350 Lariat CC DRW 6.0L PSD
Bullet-proofed including Sinister Diesel Coolant Filtration System. Train Horn, Killer Audio w/ back-up cam & subs and Re-upolstered seats...238k and running strong!!

Last edited by Pathfinder22; 04-03-2010 at 03:31 PM. Reason: fuggin typo's again....
Pathfinder22 is offline  
post #7 of 59 Old 04-03-2010, 03:46 PM Thread Starter
Powerstroke.org Fanatic
 
Pathfinder22's Avatar
 
Join Date: Dec 2008
Posts: 134
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 2 Post(s)
Feedback Score: 0 reviews
I think I found what I'm looking for and assuming the local muffler shop has some 3.5" pipe they can use if muffler replacement is done...BUT I don't want to lose the muffler if it's gonna be too loud???

03-07+ Ford 6.0L Powerstroke Diesel Cat Delete Pipe


'06 F350 Lariat CC DRW 6.0L PSD
Bullet-proofed including Sinister Diesel Coolant Filtration System. Train Horn, Killer Audio w/ back-up cam & subs and Re-upolstered seats...238k and running strong!!

Last edited by Pathfinder22; 04-03-2010 at 03:46 PM. Reason: typo
Pathfinder22 is offline  
post #8 of 59 Old 04-03-2010, 05:43 PM
Compression Ignition Addict
 
HOTWHEELS34's Avatar
 
Join Date: Nov 2006
Location: Layton, Utah
Posts: 370
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
If you lose the cat and muffler it's going to be loud. One of the main reasons people go to a larger exhaust is to lower EGTs.

2005 F350 CC SB ,Turbo-back Silverline 304 ss , RCD EGR delete , Elite VGT-SS turbo , SCT tunes by DJ's , cat delete , Autometer triple gauges , 20" MKW M19 , Toyo 38 x 15.50 x 20 , Icon 4-link 10in. lift , Dual Sway-a-way coilovers and shocks , Pioneer Avic F90BT, OUO Driveline Drop, CCV reroute , FS-2500 oil bypass, Mag-Hytec diff covers , Amp steps


Wanting a Cummins swap.
HOTWHEELS34 is offline  
post #9 of 59 Old 04-03-2010, 05:47 PM
Compression Ignition Addict
 
wesjones's Avatar
 
Join Date: Sep 2005
Posts: 422
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Let's back up here.......$800 for a 4" cat back exhaust? I think you need to do a little more shopping there, they arent all that expensive. Mine is aluminized steel and it has held up fine.

2001 F-250 XL 7.3 PSD, 5" MBRP Turbo-Back Exhaust, K&N FIPK Intake...



www.intelexattachments.com
wesjones is offline  
post #10 of 59 Old 04-03-2010, 05:57 PM
Compression Ignition Addict
 
smokersteve's Avatar
 
Join Date: Nov 2008
Location: California
Posts: 4,335
Thanks: 0
Thanked 7 Times in 7 Posts
Mentioned: 0 Post(s)
Quoted: 19 Post(s)
Feedback Score: 0 reviews
Quote:
Originally Posted by Pathfinder22 View Post
Smokersteve;

Thanks, as that's the info I'm looking for. Since I don't care about sound & my system is all stock, I assume there is no need to upgrade to 4" exhaust.

I am very interested in doing the cat & muffler delete, and curious - what will that do to the overall sound?? I don't want it any louder, and if it will be...maybe I should do the cat delete??

Can someone point me to where I can purchase the cat & muff delete pipe?? Gonna go that route.

This ws not intended for sound but it worked very well.

I purchased a tip from kregan auto parts that had 2 layers of metal.
In between the to metal layers there is some kind of wrap, like fiber glass or something. The inner metal layer has perforations. This decrased the exh noise. I also cut the last exhaust bend to face the rear of the truck, not the side. That also decreased the noise.(to the cab)
smokersteve is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome