4" or 5" - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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post #1 of 12 Old 12-25-2012, 10:21 AM Thread Starter
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Question 4" or 5"

Did a quick search and really didn't find much on here about this so here we go. What do you all think? 4" turbo back or a 5" turbo back. Either way I will be going with a no cat, no muffler straight pipe and looking to do a 4" DP. I like the idea of the 5" just cause I'm a "Go big or stay home" kind of person, but I don't want to hurt any performance or MPG's either. To date I have had the motor rebuilt with crower rods, J&E slugs, O-ringed heads, etc. I have an edge with attitude programmer on there, and I'm really just looking to do an exhaust and intake upgrade and start on drivetrain. I appreciate your thoughts, and I hope everyone and their families have a wonderfull Christmas.
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post #2 of 12 Old 12-26-2012, 01:40 AM
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What other performance mods are you going to have done?? A 4" exhaust is plenty big enough for your mods.


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post #3 of 12 Old 12-26-2012, 02:35 AM
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As stated above 4" is enough to support up into the 500hp. With that said I still went 5" and love it. The sound is great and I love the look of the larger pipe its kinda intimidating to others when they see it.

03 F350 6.0 SRW 4X4 lariat

481hp 832tq

8" super lift 385/70r16 Toyo MT's
FatBoy traction bars
Durastroke stg1
intake
MBRP 5" straight pipe
Custom tuned by Vivian "Looney Wild Track"
Edge Insight CTS
Zoodad mod
high idle mod
6.4 banjo bolts
Updated fuel pressure regulator (Blue spring mod)
EGR cooler delete
6K 55w HID's
6k 35w fog HID's
B&W turnover ball


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post #4 of 12 Old 12-26-2012, 03:50 AM
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5" is all about being heard. 4" is a great balance of sound but not loud.

currently driving a 335i bmw, no more powerstoke

Previous powerstrokes-
2002- F250 XL 7.3 auto, 4x4
2001- F250 Lariat 7.3 auto, 4x4
2002- F350 Lariat 7.3 Dually, auto, 4x4. 141k miles
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post #5 of 12 Old 12-26-2012, 05:42 AM
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I have a 4" straight pipe with a 5" tip. When I open it up, my 2006 6.0L rumbles and roars like a '72 Oldsmobile Cutlass 442 (for those of you who have ever heard one). Yet at idle and regular throttle, it's much quieter and more pleasant sounding than the 5.9L or even the 6.7L Cummins. I am really happy with it, and would not want it any louder. The 5" tip is just right proportionally, in my opinion; a 6" tip is overkill aesthetically.

ROB
2006 F350 Lariat CC LB FX4 Dually Auto 4.10

MODS:
Edge Insight CTS
SCT X4 Quicktricks Custom Tunes
KC Stage 2
MBRP 4" Turboback Straightpipe Exhaust
BPD 58v FICM, PHP Atlas 80 Tune
IPR High Flow Coolant Filter
ARP Head Studs & EGR Delete
Blue Spring
DC Power 250 Amp Alt & Big 3 Upgrade
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IPR Remote Oil Cooler
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post #6 of 12 Old 12-26-2012, 05:57 AM
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4" exhaust is large enough flow for 800hp. all the tips do is change the tone of the exhaust sound and i have not found one that sounded good yet. also i have never been intimidated by some ones exhaust. Some of the dodge guys put 8" and 10" tips on there trucks it just makes me laugh And all the cops for miles can hear where they are when they get in the peddle. just my 2$


2004 F250 4x4
1) head studs
2) 4" turbo back exhaust MBRP muffler
3) super expensive built transmission
4) leveling kit and 3.73 gears with a locker
5) Full EGR delete
6) Air Dog 2 165
7) full set of gauges
8) ladder bars
9) smoke switch (I Don't use it)
10) eliminated banjo bolts for 90 degree fittings
11) tuned by lots of people
12) ported heads
13) 190/75%
14)Powermax turbo

Last edited by jimmyz32; 12-26-2012 at 06:04 AM.
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post #7 of 12 Old 12-26-2012, 06:49 AM
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^ yea i didn't mean intimidating to other diesel owners just some of my friends who are import drivers and people that don't know diesels. yes the 5" can be loud but normal driving and idle its pretty reasonable. my truck having a 10 blade MTW stg 1 turbo whistles it A** off at idle and light to normal acceleration, but when you get into to the throttle it is loud ill be the first to tell you but it doesn't bother me i don't get into the throttle much don't have to with tuning.

03 F350 6.0 SRW 4X4 lariat

481hp 832tq

8" super lift 385/70r16 Toyo MT's
FatBoy traction bars
Durastroke stg1
intake
MBRP 5" straight pipe
Custom tuned by Vivian "Looney Wild Track"
Edge Insight CTS
Zoodad mod
high idle mod
6.4 banjo bolts
Updated fuel pressure regulator (Blue spring mod)
EGR cooler delete
6K 55w HID's
6k 35w fog HID's
B&W turnover ball


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post #8 of 12 Old 12-26-2012, 05:50 PM
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I have the MBRP 4" turbo back straight pipe system and it's pretty damn loud. At idle it sounds like a jet and it lets out a lot of turbo whistle. Once you hit 2200-2500 RPM area it really starts to howl. Sounds incredible at WOT. The turbo whistle is really loud and sounds great. It's hard to resist flooring it under bridges or through tunnels.

http://www.powerstroke.org/forum/signaturepics/sigpic144660_1.gif
2004 F350 CCSB Lariat FX4
Powermax
Edge CTS w/ EGT, Fuel Pressure
SCT tuner with Innovative Tunes
Fleetrite ELC, Rotella T-6
MBRP 4" turbo-back straight pipe
XDP Coolant Filter
NUC Motorsports Oil Bypass
Pioneer AVH3500BHS head unit, backup cam, Sirius/XM, Kicker speakers, Kicker 500.1 Amp, 2x Kicker 10" subs
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post #9 of 12 Old 12-26-2012, 06:51 PM
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I like my 5", if you are considering both you will probably regret not getting the 5. Thats why I got mine

Will

2010 FORD F250 LARIAT CCSB 6.4
-H&S Mini Maxx / Edge Insight CTS / 4" Flo Pro Dump / 20" Fuel Hostages / 33" Toyo AT's / Airdog II 4G

2006 FORD F250 LARIAT CCSB 6.0 - TRADED

2000 FORD F250 LARIAT CCSB 7.3 - SOLD
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post #10 of 12 Old 12-27-2012, 07:39 AM Thread Starter
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Thanks for all the replies guys. I think I'm going to order the 5". I don't mind loud and would hate to have regrets down the road. As for future mods, who knows. Right now there is plenty of power for me, but opinions like that change fast. First time i get taken by a duramax I may be looking at nitrous and twin turbos!
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