4" or 5" straightpipe?
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Mountain Pass
Joined: Feb 2004
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From: Spokane, WA
4" or 5" straightpipe?
Is there any significant difference between putting on a 4" or 5" straightpipe w/ 4" DP. I've read other posts on the topic, and it seems the exhaust tone being a little deeper w/ 5" is about the only difference. Is it a lot deeper or about the same? I recently cutout the muffler and have it straightpiped w/ stock size. It really helps the turbo spool up faster, and it sings great. Although, it sounds terrible when the EBPV closes to warm-up and the EGT's did not drop much. Has anyone tried both 4" and 5"? If so, which did you prefer? Thanks for any info.
Laughing Gas
Joined: Jan 2004
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From: Prince George, BC
i was just wondering how bad the stock pipe sounds when the ebpv kicks in, i like the sound of it, it sounds like a jet, but i was thinking of taking the stock muffler out. so i thought i would ask you since you have yours out, what does it sound like (why it sounds terrible) does it sound like a bigger jet now???
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From: The Great Plains
Originally Posted by mybigredford
i was just wondering how bad the stock pipe sounds when the ebpv kicks in, i like the sound of it, it sounds like a jet, but i was thinking of taking the stock muffler out. so i thought i would ask you since you have yours out, what does it sound like (why it sounds terrible) does it sound like a bigger jet now???
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Mountain Pass
Joined: Feb 2004
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From: Spokane, WA
Well, maybe I should rephrase that. It dosen't sound terrible, but it doesn't have that deep, mean sound that I like. Some mornings I let it idle in the parking lot at work and when the EBPV kicks in everyone that walks by stands there and stares for a minute trying to figure out what is wrong. I then have to explain the whole EBPV function and straightpipe. It's really kinda funny. Is Ford the only trucks w/ EBPV? A few guys have Dodge/Cummins and they have never heard of EBPV.
Last edited by RedDragon; Mar 20, 2005 at 09:28 PM.
Elder User
Joined: Oct 2004
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I had a 3.5" straight pipe with the stock down pipe. I just switched to a 4" d/p and 5" straight pipe. I didn't notice any cooler egt's but it looks cool! I personally think it sounds way better. Deeper throaty sound with less turbo flutter. BTW I did need to put a small dent in the 5" pipe to clear the crossmember bolts.
Postmaster
Joined: Dec 2003
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From: STEPHENVILLE,TX!!!!!
i had 4" on my truck and bigger injectors forced me to go 5 to keep egt's down and flow the air. if your gonna stay mild on the mods 4" is fine, if your thinking about injectors and a bigger turbo go 5"
sounds sweet one way or the other.
sounds sweet one way or the other.
Senior User
Joined: Nov 2004
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From: Central Wyoming
Originally Posted by mybigredford
i was just wondering how bad the stock pipe sounds when the ebpv kicks in, i like the sound of it, it sounds like a jet, but i was thinking of taking the stock muffler out. so i thought i would ask you since you have yours out, what does it sound like (why it sounds terrible) does it sound like a bigger jet now???
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Posting Guru
Joined: Aug 2004
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From: Braham MN
Like kilapapipa said. big pipes and the EBPV = lots of noise.
The dual fives where like that, twice, so I unplugged it.
bigger pipes will magnify any sound except the turbo flutter, maybe its just cuz I have duals, but mine flutter's a whole lot less then my buddies "stock" straight exhaust.
The only restriction in my exhaust is the down pipe, after that it was 2 1/2 dual into 5" side pipes, then I had it all changed to dual three" into the side pipes, the tone got ALOT deeper, and the whistle got insane. when you rug it, it's crazy loud, i love it, but quiet inside
The jump to the three didn't realy lower EGT's, but it did give me a boost in boost, only a couple of PSI and only noticeable at 100 MPH and FLOORED!!
it all depends on money, 4 or 5. do what you can afford, both will work fine.
Diesel Rod
The dual fives where like that, twice, so I unplugged it.
bigger pipes will magnify any sound except the turbo flutter, maybe its just cuz I have duals, but mine flutter's a whole lot less then my buddies "stock" straight exhaust.
The only restriction in my exhaust is the down pipe, after that it was 2 1/2 dual into 5" side pipes, then I had it all changed to dual three" into the side pipes, the tone got ALOT deeper, and the whistle got insane. when you rug it, it's crazy loud, i love it, but quiet inside
The jump to the three didn't realy lower EGT's, but it did give me a boost in boost, only a couple of PSI and only noticeable at 100 MPH and FLOORED!!
it all depends on money, 4 or 5. do what you can afford, both will work fine.
Diesel Rod
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Senior User
Joined: Apr 2004
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From: Roaring Branch, PA
I have read on here awhile ago that you don't need 5" unless your pushing 500 H.P., as a matter of fact, I think I've also read that you loose a little low end torque going from 4" to 5".
Postmaster
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From: Bonney Lake, WA
4" is all you need until you approach 450hp. A 5" system will run a little cooler, sound a little deeper, and look a whole lot better. I've gotten used to the size of my 5" system with 6" tip, but it sure draws attention at the truck stop. I can't get out of there in less than an hour, answering questions. 
Click here.
Click here.
Posting Guru
Joined: Aug 2004
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From: Rural Central Ohio
Where do you all get your straightpipes!?? LOL Nobody here in my neck of the woods can make one. Every shop I've called can't do 4 inch piping in their mandrel and can't make straight pipes. Is the superduty exhaust straight enough to just run a pipe to the rear axle and buy a pre-bent elbow?
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>Where do you all get your straightpipes!?? LOL Nobody here in my neck of the >woods can make one. Every shop I've called can't do 4 inch piping in their >mandrel and can't make straight pipes. Is the superduty exhaust straight >enough to just run a pipe to the rear axle and buy a pre-bent elbow?
Yep go to the big truck shop and look around. Well at least with a 6 speed, I haven't looked at a auto yet.
Yep go to the big truck shop and look around. Well at least with a 6 speed, I haven't looked at a auto yet.
Elder User
Joined: Feb 2000
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From: LAKE FORK TEXAS
I have a neighbor down the road with 5" pipe and it sounds much better than any powerstroke I ever heard, ALOT deeper tone,flutter is almost not even noticable, If i had it to do over again it would be 5" from the down pipe back, Unbelievable difference in sound over the 4" for sure.
Laughing Gas
Joined: Jan 2004
Posts: 807
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From: Prince George, BC
well after reading your posts, i think i might take my muffler off. my stock system is still in great shape, and i love the sound of the ebpv makes, so if you guys say taking the muffler out intensifies it more than i am all for it. i dont want to spend money on a bigger exhaust system until the stock one rusts out. hehe i cant wait. i have this neighbor that is a real ********* with his truck (or should i say staightpipes), so i hope this kinda gives him a taste of his own medicine!!! i guess potatoes in his pipes didnt work, maybe if i park in front of his house and wake him up at 10PM everynight he will get the hint. wish me luck!!
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Mountain Pass
Joined: Feb 2004
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From: Spokane, WA
I was thinking I would order a piece of 5" tubing and a 4"-5" adapter to go on at the DP, then exit in front of the rear tire w/ an elbow. Think that will work, and/or clear the tranny crossmember?