Exhaust Upgrade - Ford Powerstroke Diesel Forum

6.4L Performance Parts Discussion What has or has not worked for you?

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 17 Old 06-24-2010, 05:02 AM Thread Starter
Compression Ignition Addict
 
HoosierHick's Avatar
 
Join Date: Nov 2007
Location: Benton County, Indiana
Posts: 227
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Exhaust Upgrade

Ok guys I have a few exhaust questions.

First of all is it worth it to do the 4" downpipe? what gains can I expect from this?

Second of all, and my bigger question, is should I keep the 4" exhaust I have now, or upgrade to a 5" system?

Currently my exhaust is a cat-back 4" system. I am planning on getting down there sometime and cutting the cat out, I have the pipe and clamps to do it. I was just thinking that if I am working on the exhaust anyways maybe I should go ahead and update the entire system.

My next question, in following with the 5" question, is what system should I get and where is the best place to get one? What gains will I see with the 5" system? Is it mostly just a sound thing, or will upgrading increase mpg's and lower egt's as well?

Thanks for any help

2008 F250 POWERSTROKE DIESEL
Fully Loaded Lariat 4x4 SuperCab
Spartan Tuned--275
DPF Delete, MBRP Exhaust, AFE Intake
35" Toyo M/T's
Paid for by the hard work of a 17 year old

HoosierHick is offline  
post #2 of 17 Old 06-24-2010, 06:02 AM
Compression Ignition Addict
 
smotrs's Avatar
 
Join Date: Feb 2008
Location: Covina, Ca.
Posts: 2,709
Thanks: 0
Thanked 2 Times in 2 Posts
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Feedback Score: 0 reviews
The 5in will give you a slightly deeper sound then a 4in. No one has actually posted numbers showing the difference between a 5in and 4in as far as power.

The 5in won't have the same amount of back pressure that the 4in has, so it's possible that you could even lose some power.

Shaun

'08 F250 6.4L Lariat 4x4 CC/SRW fully loaded, special ordered
6" Fabtech 2.25 dual shock lift w/18" AR wheels, 35" Toyo AT's
Avic-Z2 Nav/Stereo w/iPod, Bluetooth, XM NavTraffic
(2) Rear headrest mnt DVD entertainment systems
Line-X bedliner
Banks CAI, Dual Exhaust, Six-Gun, Speed Brake & iQ (test vehicle)
Bushwacker Fender Flares
Ravelco Anti Theft Device

Quote:
Originally Posted by Rick Santorum
We went into a recession in 2008 because of gasoline prices.
smotrs is offline  
post #3 of 17 Old 06-24-2010, 06:12 AM
Compression Ignition Addict
 
jac97psd's Avatar
 
Join Date: Feb 2009
Location: Frisco, TX
Posts: 1,147
Thanks: 0
Thanked 2 Times in 2 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
I have a 5 inch on my truck and I love it. It sounds great especially at WOT. Now if there is any power difference I don't know. But if you are running a tuner I don't think the lost of power if any from less back pressure wouldn't be noticeable.
jac97psd is offline  
post #4 of 17 Old 06-24-2010, 06:15 AM
Compression Ignition Addict
 
jac97psd's Avatar
 
Join Date: Feb 2009
Location: Frisco, TX
Posts: 1,147
Thanks: 0
Thanked 2 Times in 2 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
And as for the downpipe it's up to you. I heard if you aren't making serious power you don't need it. But other guys claim it helps out a lot. So it's all up to you.
jac97psd is offline  
post #5 of 17 Old 06-24-2010, 06:32 AM
Powerstroke.org Sponsor

 
greasltn's Avatar
 
Join Date: Jan 2009
Location: Hillsborough, NC
Posts: 1,011
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
The downpipe will decrease spool up time therefore faster take off. Less backpressure after the turbos is a plus, but you will not notice a performance difference between the 4" and 5".

-John
Rudy's Diesel Performance - 919-383-9300 - Diesel Tech

WWW.DPFDELETEKITS.COM
greasltn is offline  
post #6 of 17 Old 06-24-2010, 08:09 AM
Member
 
Join Date: Dec 2009
Location: Memphis
Posts: 65
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
I look at like this. If I am buying my wife a new set of tits I am going with the double D's not the B cup. So I would go 4" down pipe & 5" straight all the way back. You cant beat the deals from Rudy's Performance. Just my 2 cents
gregw338 is offline  
post #7 of 17 Old 06-24-2010, 11:08 AM
Compression Ignition Addict


 
08stroker250's Avatar
 
Join Date: Dec 2008
Location: Georgia
Posts: 8,819
Thanks: 5
Thanked 16 Times in 15 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
I recommend the 4" downpipe if your willing to do it. If your iffy about it then I wouldn't worry about it. As for the exhaust size, I prefer 5" over 4", but 4" gets the job done.

Jeff Dodd
spartan_jeff12@yahoo.com

2012 Ford F-250 Lariat CC/SB

Mods - Spartan tuned via laptop, 4" AFE stainless exhaust system, 2.5" PMF BMC leveling spacers, 3" PMF lift blocks, Fox Racing 2.0 shocks, Recon smoked mirror & cab lights
08stroker250 is offline  
post #8 of 17 Old 06-24-2010, 02:02 PM
Member
 
Join Date: May 2010
Location: Johnston County North Carolina
Posts: 72
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Is their anything negative about adding the 4 inch down pipe?
Jpr8771 is offline  
post #9 of 17 Old 06-24-2010, 02:04 PM
Compression Ignition Addict


 
08stroker250's Avatar
 
Join Date: Dec 2008
Location: Georgia
Posts: 8,819
Thanks: 5
Thanked 16 Times in 15 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Well, not sure actually. I don't know if anyone has been denied warranty work because of aftermarket one. Really the only way to get the stock downpipe back in....and that is if you don't cut it to get it out....is to lift the cab. That would be the only downside of it.

Jeff Dodd
spartan_jeff12@yahoo.com

2012 Ford F-250 Lariat CC/SB

Mods - Spartan tuned via laptop, 4" AFE stainless exhaust system, 2.5" PMF BMC leveling spacers, 3" PMF lift blocks, Fox Racing 2.0 shocks, Recon smoked mirror & cab lights
08stroker250 is offline  
post #10 of 17 Old 06-24-2010, 02:12 PM
Compression Ignition Addict
 
DSTRBD's Avatar
 
Join Date: Mar 2008
Posts: 2,374
Thanks: 0
Thanked 4 Times in 4 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
4" down pipe back is more than enough for most people. 5" will make it sound louder and deeper, but you wont gain much of anything for power or EGT drop. The down pipe will help some with EGTs if you are looking to get every little bit out of it.



ICON Vehicle Dynamics | S&B Intakes | MBRP Exhaust | American Force Wheels | Diamond Eye | AFE Intakes | Carli Suspension | Industrial Injection | Garrett Turbos | FASS | Method Wheels | Bilstein Shocks | Airdog | KMC Wheels | Spartan | RSouth Bend Clutch | SCT | Edge Products | ATS Diesel | Bullydog | BMF Wheels | AMP Research | & much more....

DSTRBD 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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

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