Downpipe - Ford Powerstroke Diesel Forum

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post #1 of 13 Old 06-10-2013, 05:49 PM Thread Starter
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Downpipe

I have straight piped my oem exhaust. I'm wanting to get a downpipe for my Truck. What should I go with a 4in, 3in, or 3.5 in downpipe? I was thinking of going with diamond eye.

early 99 Red F-250 XL SD, 7.3L, 6-speed manual, Extended Cab, Long Bed, 4x4 Off Road, and Reflexxion Cowl Hood, Ion Alloy 183 wheels, 05 headlights with 6000k AC HID kit, and led turn signals, Ford ASI filter w/ zoodad mod and foam sleeve, TS 6 position chip, Auto Meter Z series Boost and EGT gauges, and straight pipe oem exhaust. .

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post #2 of 13 Old 06-10-2013, 06:11 PM
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Unless fitment is an issue on the early 99's there is no reason not to got with a 4"

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post #3 of 13 Old 06-10-2013, 06:12 PM Thread Starter
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3.5in or 3in?

early 99 Red F-250 XL SD, 7.3L, 6-speed manual, Extended Cab, Long Bed, 4x4 Off Road, and Reflexxion Cowl Hood, Ion Alloy 183 wheels, 05 headlights with 6000k AC HID kit, and led turn signals, Ford ASI filter w/ zoodad mod and foam sleeve, TS 6 position chip, Auto Meter Z series Boost and EGT gauges, and straight pipe oem exhaust. .

CAROLINA GRAY BOY
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post #4 of 13 Old 06-10-2013, 06:19 PM
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Get a 4" down pipe. I have a e99 and that's what I run.

I have a full 4" straight pipe exhaust.

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Colin S. Age:22 Certified Diesel Tech, Infantry US ARMY
E99 7.3 6spd 4x4 6637, 4" straight pipe, 365,000 miles
"wear your high mileage as a badge of honor"

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post #5 of 13 Old 06-10-2013, 06:21 PM
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In my opinion. Straight piping a stock exhaust then putting a big down pipe on it is kinda worthless. Sure your opening it up at the turbo but as soon as you hit the stock exhaust its right back to the restrictive stock exhaust size.

Your truck your money. That's just my opinion.

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Colin S. Age:22 Certified Diesel Tech, Infantry US ARMY
E99 7.3 6spd 4x4 6637, 4" straight pipe, 365,000 miles
"wear your high mileage as a badge of honor"

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post #6 of 13 Old 06-10-2013, 06:26 PM
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Quote:
Originally Posted by Colin7.3 View Post
In my opinion. Straight piping a stock exhaust then putting a big down pipe on it is kinda worthless. Sure your opening it up at the turbo but as soon as you hit the stock exhaust its right back to the restrictive stock exhaust size.

Your truck your money. That's just my opinion.

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I agree, but replacing a stock down pipe with 3 or 3 1/2" is just as big a waste.
Waste of time and money because the improvement will be next to nothing

PIS 175/80's, Van Turbo with EBPV, BD Billet Wheel
Lots of money spent at RiffRaff
Holley fuel pump, in tank mods, crappy riding leveling kit, DP-F6, 5 Gauges+Edge CS in dash, CB radio in Dash, over 100 goofy little mods
Still pretty slow, just less slow now.
Quote:
Originally Posted by peixinho View Post
I love finally having my truck back... that 7.3 dog that I was driving was just not cutting it.
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post #7 of 13 Old 06-10-2013, 06:35 PM Thread Starter
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The factory dp is flattened from the factory so I was thinking that getting a new dp that is not flattened would open it up lower egts and maybe get a little better power.

early 99 Red F-250 XL SD, 7.3L, 6-speed manual, Extended Cab, Long Bed, 4x4 Off Road, and Reflexxion Cowl Hood, Ion Alloy 183 wheels, 05 headlights with 6000k AC HID kit, and led turn signals, Ford ASI filter w/ zoodad mod and foam sleeve, TS 6 position chip, Auto Meter Z series Boost and EGT gauges, and straight pipe oem exhaust. .

CAROLINA GRAY BOY
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post #8 of 13 Old 06-11-2013, 02:53 AM
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It may help a little but then you've still got your restrictive stick exhaust pipe size. Think of it like this. You have a 3 lane highway. Well one lane is under construction. So the third lane has to merge into the other two. As we All know this causes the highway to slow down and back up. This is basically what's happening in your exhaust pipe. It may even end up hurting you cause of the restriction it could cause.

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Colin S. Age:22 Certified Diesel Tech, Infantry US ARMY
E99 7.3 6spd 4x4 6637, 4" straight pipe, 365,000 miles
"wear your high mileage as a badge of honor"

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post #9 of 13 Old 06-11-2013, 03:25 AM
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I would agree you may not see any power gains if anything I would do a whole 4" from the turbo back with a muffler delete then you will have better flow
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post #10 of 13 Old 06-11-2013, 01:08 PM
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the stock exhaust is 3.5 inch.
so if you can find a 3.5 downpipe you might be able to mate it to the stock exhaust fairly easy.

but a downpipe is 100 bucks. a whole kit is like 220-250.

99.5 f250 7.3 4x4 258k
PHP Phoenix, S&B CAI, 4" TBE, Hpx, Stancor, RR Billet Wheel, AIH Delete, Autometer Gauges, Leveling kit, Transgo kit, Warn Hubs, Int'l Up-Pipes, RR IC Boots, Non-Ebpv Pedestal, High Flow Outlet, RR OCR, 08 Tow Mirrors.

Dad-2000 7.3 109k miles, Autometer Gauges, Superchips 1705, AIH Delete, 6637, 4" TBE, BD Billet Wheel, TruCool Max
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