4" vs 5" Single Exhaust - Ford Powerstroke Diesel Forum

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post #1 of 42 Old 03-04-2012, 05:41 PM Thread Starter
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4" vs 5" Single Exhaust

Hi, thinking of putting a new exhaust on my truck considering it is still stock. I was going to go with the cheaper option and just do a single turbo back. I was wondering the difference between the 4" single and the 5" single. I know there is a size and a noise, but exactly how pronounced is it? Would buying a 5" inch sound much different/better than all the 4 inchers running here? Let me know what you think. Thanks for reading


1995 F.250 Powerstroke E4OD 159k and climbing.
DIY Intake.
5" Diamond Eye

Plans to come:
On/off Torque Lock Switch
TS 6 position chip
Injectors
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post #2 of 42 Old 03-04-2012, 08:19 PM
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5" straight pipe sounds as throaty as the low end grunt of a 6.0L with less whistle of course but still sounds pretty badass I'm also running a 6"x48" stack

1997 F250 7.3 powerstroke SCLB HD XLT
340,000 Mi.
Blown Tranny Mod
D60 Swap
4:10's
DIY E-FUEL
PHP 6 pos.
S&B CAI w/Prefilter
EBPV Delete
3" DP
Kitty Delete
Cat Back 5"
Aeroturbine 5050XL Muffler
6" Vented Tip
S.S. HPX
17"X10" Pacers
4" Rough Country Susp. Lift
KW 17 LED CabLights
35"X12" BFG KM2's
Tint 20%
Magnum CB 104" Whip
Quad A-PillarPod
GlowShift Digital Gauges

Future mods: ??? 1.5 Sticks T500

1996 ECLB XLT SOLD
1997 ECLB HD SOLD


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post #3 of 42 Old 03-04-2012, 11:03 PM
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Won't notice any difference performance wise between a 4" and 5" pipe. The max DP size (without custom fab work) on an OBS is 3.5" with most people running a 3". That is going to be your restriction point. An addition inch after the downpipe won't effect the CFM that the exhaust can flow.
You will notice a difference in sound. 4" will let the turbo sing a little more, and the 5" will have more of a rumble to it.
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post #4 of 42 Old 03-06-2012, 01:01 PM
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i have a 5" and my trubo whistles pretty loud and it has a very nice tone to it

Zac
97 F-350 sclb
3" dp 5" exhaust
6637 intake
ts chip tw tunes
rosewood stage 1's
cali to 49 state PCM swap.
American Racing AR23 wrapped with 265/75 General Grabber AT2
20% window tint
Tinted taillights
Kenwood headunit
Kenwood speakers all the way around
8" kicker subwoofer

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post #5 of 42 Old 03-07-2012, 09:22 AM Thread Starter
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Thanks for the feedback guys I appreciate it.


1995 F.250 Powerstroke E4OD 159k and climbing.
DIY Intake.
5" Diamond Eye

Plans to come:
On/off Torque Lock Switch
TS 6 position chip
Injectors
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post #6 of 42 Old 03-09-2012, 01:04 PM
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I got bored one day and took a video of mine. It is 5" and I love it, sounds real good. I know the sound isn't the best, but I think you can get the idea.
97 F-250 7.3 Powerstroke 5" Exhaust Start Up - YouTube

My Truck
97' F-250HD. ECLB. 66,000 miles. 7.3. E40D. 6637 Filter. 5" Exhaust. Deleted EBPV. CCV mod. 45 gal. Transferflow Rear Tank. Stock for now. Dana 60 in the works.
My Dad's
97' F-250HD. ECLB. 18x,xxx miles. 7.3. E40D. 6637 Filter. 4" Exhaust. TW Tunes. Work Truck.
97' F-250HD. ECLB. 150,000 miles. 7.3. E40D. 4" Exhaust. Work Truck.

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post #7 of 42 Old 03-09-2012, 04:08 PM
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Quote:
Originally Posted by backwoodsboy View Post
Won't notice any difference performance wise between a 4" and 5" pipe. The max DP size (without custom fab work) on an OBS is 3.5" with most people running a 3". That is going to be your restriction point. An addition inch after the downpipe won't effect the CFM that the exhaust can flow.
You will notice a difference in sound. 4" will let the turbo sing a little more, and the 5" will have more of a rumble to it.
where is this 3.5 dp you speak of ? lol , im gussing you really gatta cut that firewall on the bottom to fit it in huh ?
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post #8 of 42 Old 03-09-2012, 04:10 PM
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Here's a vid with my 3" diamond eye downpipe and 5" cat delete to a 6"x48" stack


1997 F250 7.3 powerstroke SCLB HD XLT
340,000 Mi.
Blown Tranny Mod
D60 Swap
4:10's
DIY E-FUEL
PHP 6 pos.
S&B CAI w/Prefilter
EBPV Delete
3" DP
Kitty Delete
Cat Back 5"
Aeroturbine 5050XL Muffler
6" Vented Tip
S.S. HPX
17"X10" Pacers
4" Rough Country Susp. Lift
KW 17 LED CabLights
35"X12" BFG KM2's
Tint 20%
Magnum CB 104" Whip
Quad A-PillarPod
GlowShift Digital Gauges

Future mods: ??? 1.5 Sticks T500

1996 ECLB XLT SOLD
1997 ECLB HD SOLD


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post #9 of 42 Old 03-09-2012, 10:07 PM
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Mine from in the cab. 3"dp 5" from dp to the top of the stacks



Mike 1997 F250 totaled 11/19/12
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post #10 of 42 Old 03-12-2012, 01:53 PM Thread Starter
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Thanks guys I appreciate the feedback. I'm going with the 5" I've decided I'll let you know how it goes once it arrives and is on.


1995 F.250 Powerstroke E4OD 159k and climbing.
DIY Intake.
5" Diamond Eye

Plans to come:
On/off Torque Lock Switch
TS 6 position chip
Injectors
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