Turbow Downpipe or No? - Ford Powerstroke Diesel Forum
6.4L Performance Parts Discussion What has or has not worked for you?

User Tag List

LinkBack Thread Tools Display Modes
post #1 of 5 Old 03-26-2014, 10:12 AM Thread Starter
Powerstroke.org Fanatic
08StormTrooper's Avatar
Join Date: Mar 2014
Location: Argyle, TX
Posts: 102
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
Turbow Downpipe or No?

Have installed new AFE intake, deleted the dpf with a simple straight pipe, and the rest of the exhaust is stock. Essentially my question is: do i get a 4" turbo down pipe and replace it or wait awhile for some cash-flow and get a full 5" turbo back exhaust? Is the labor/cost of a down pipe at this point worth it? Also, deleting EGR this weekend, will probably need help with that. Thanks all.

'08 Ford F-350 Super Duty
6.4L V8 Turbo Diesel
DPF/CAT delete
EGR delete
AFE Stage II R5
AFE 4" Turbo back exhaust
AFE Turbo Intercooler

Strokin' since the start.
08StormTrooper is offline  
Sponsored Links
post #2 of 5 Old 03-26-2014, 01:26 PM
Compression Ignition Addict
Join Date: Jan 2014
Location: orlando
Posts: 181
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 2
Thanked 17 Times in 16 Posts
Feedback Score: 0 reviews
From my understanding all the down pipes are 4" even if the rest of the exhaust is 5" also I don't think there's much to gain by doing the down pipe except lower EGT's minimal performance gains. Also the install either requires the cab to come off or if you don't care about the stock DP you have to cut it in half to get it out. Maybe someone with more direct experiance will chime in but all of what I mentioned was from various threads on this forum

2008 CCSB Lariat
Spartan 250EL
Flo-Pro 5" DP back
S&B Intake
Sinister EGR Delete
Kris 6.4 is offline  
post #3 of 5 Old 03-26-2014, 01:55 PM
Fueling M.A.D. Everywhere
CountryAggie's Avatar
Join Date: Sep 2011
Location: Rockwall, TX
Posts: 1,890
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 4
Thanked 46 Times in 29 Posts
Feedback Score: 1 reviews
It's a 20-30 min change by yourself. You do have to cut the original DP, but why would you want to out it back in? It's super restrictive. Benefits are a little more power (don't have hard numbers, and probably not enough for you to actually feel, but removing any constrictions improves power and efficiency). I noticed less smoke, quicker turbo spool, quicker smoke cleanup, a bit less EGT temp.

All down pipes are 4". I don't think a 5" will fit between the engine and firewall (therefore I'm relatively sure they aren't made).

While you are doing it, get some titanium header wrap (1200 degree) and wrap the top half of the new DP.

Sent from AutoGuide.com App
CountryAggie is offline  
post #4 of 5 Old 03-26-2014, 03:41 PM
Premium Member
B585Ford's Avatar
Join Date: Nov 2011
Location: West By God Virginia
Posts: 1,806
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 35
Thanked 73 Times in 67 Posts
Feedback Score: 0 reviews
You can remove it from top but it is much easier to cut the old one up. If you go in from the top you have to remove the intake from the CAI and unhook the fuel cooler and move it outta the way....way to big of a PIA to be worth it.
I thought I read somewhere on here someone (maybe Flow Pro) sold a 5" DP....I have no idea how the ch#t that would fit and how you keep it from banging the firewall. I agree with Aggie do a 4" and wrap it. As he said, there wont be huge noticeable gains, but IMO it is definitely worth it. I would do it now rather than wait if it is in your budget.

2008 F350 ZF6 daily driver
No Limits CAI and every air mod, MM w/ GH, DPF/CAT delete 5", Sean's 4" DP, SB DD 3850, Coolant Filter, Bushwacker flares, 2.5" Icon level, SD inserts tailgate/grill, PMF Tbars w/ 5" block, Elite EGR delete, Junior High Power Atmo, ARP studs, A-1000 (Marty's), Fuel Bowl Delete, 15% nozzles, Tial WG
God Bless our military!!!!
Please see this thread:
B585Ford is offline  
post #5 of 5 Old 03-26-2014, 04:40 PM
Compression Ignition Addict
Join Date: Sep 2012
Location: Inver Grove Heights
Posts: 325
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 4 Times in 4 Posts
Feedback Score: 0 reviews
If you van get a saws all up there can cut it, it's not that bad of a job.

2008 F350 CCSB Lariat 4X4
Diamond Eye Performance 4" Downpipe to 5" Straight Pipe
Custom Intake (No Limit Fab)
CCV Mod (To Atmosphere)
Intercooler boot kit
Flo~Pro CAC pipe
Sinister EGR Delete w/intake elbow
Complete LED Conversion (Internal & External)
Fussgus is offline  
Sponsored Links

6.4, downpipe, exhaust, turbo, turbo back

Quick Reply

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


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

Email Address:


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