4" or 5" exhaust whats your take?

whats best for the ol 6.0 a 4" system or a 5" system is bigger realy better?

If you want a good sounding truck than go with a 4in dp with a 5in pipe no muffler no kitty nothing is going to soundbetter imho!

If you want a good sounding truck than go with a 4in dp with a 5in pipe no muffler no kitty nothing is going to soundbetter imho!

:whs: 5 inch sounds great!

5". Wish I'd gotten 5" instead of 4". Now I'm married, poor, and you know the rest. No more mods for me.

Is a 5" louder than a 4" inside the cab? If so how much louder.

eleventybillion times louder.
Seriously....how can anyone answer that?
How long is a piece of rope?

eleventybillion times louder.
Seriously....how can anyone answer that?
How long is a piece of rope?

LOL

eleventybillion man thats just awsomeLOL...... so on an exhaust related note 5" is where its at and i should just spend the money once and go big or go home put on a 4" and wish i had a 5"? mbrp a good system?

You will see zero performance benefit with a 5 over a 4. You will probably see some clearance issues with a 5 that a 4 won't have and no matter what anyone tells you a 3.5" downpipe is perfectly fine. 4" downpipes are just an unnecessary pain in the ass.

I love my 5 in straight pipe, but you can not mount your spare under the truck anymore. Its sounds really crazy when you put your foot in it. I do a lot of HWY driving and it does not bother me at all. I had a 4in with a muffler and I have not noticed much more road noise at HWY speeds. I got whole exhaust for $350 shipped from farm boys diesel.

Results for Ford 6.0L Powerstroke 03-07:Exhaust Systems (http://store02.prostores.com/servlet/farmboysdieselperformance/the-Ford-6.0L-Powerstroke-03-dsh-07-cln-Exhaust-Systems/Categories)

5in FTW

i got a 4inch MBRP turbo back with a 5inch tip and sounds amazing. has an amazing whistle to it and when you punch it sounds even better. thats my 2 cents

will you see a differences between the 4'' down pipe from the 3.5

You will see zero performance benefit with a 5 over a 4. You will probably see some clearance issues with a 5 that a 4 won't have and no matter what anyone tells you a 3.5" downpipe is perfectly fine. 4" downpipes are just an unnecessary pain in the ass.

so what kind of exhaust are you running unbroken? brand and setup?


I love my 5 in straight pipe, but you can not mount your spare under the truck anymore. Its sounds really crazy when you put your foot in it. I do a lot of HWY driving and it does not bother me at all. I had a 4in with a muffler and I have not noticed much more road noise at HWY speeds. I got whole exhaust for $350 shipped from farm boys diesel.

Results for Ford 6.0L Powerstroke 03-07:Exhaust Systems (http://store02.prostores.com/servlet/farmboysdieselperformance/the-Ford-6.0L-Powerstroke-03-dsh-07-cln-Exhaust-Systems/Categories)

thanks for the info and link how was the quality of the kit you got from farm boys? it fit ok? or did you have to "make" it fit?

so what kind of exhaust are you running unbroken? brand and setup?


He has a cummins in his truck...

will you see a differences between the 4'' down pipe from the 3.5

Better spool with 3.5

so what kind of exhaust are you running unbroken? brand and set up?

I run 5" pipe. All my stuff is from Grand Rock who sponsors exhaust stuff for me. I only run 5" because the outlet on my primary charger is 5".
I'm also in the neighborhood of 850-900 hp so there may be a very slight benefit to 5"

i got a 4inch MBRP turbo back with a 5inch tip and sounds amazing. has an amazing whistle to it and when you punch it sounds even better. thats my 2 cents
did you install your mbrp kit yourself and if so how did it fit?

I run 5" pipe. All my stuff is from Grand Rock who sponsors exhaust stuff for me. I only run 5" because the outlet on my primary charger is 5".
I'm also in the neighborhood of 850-900 hp so there may be a very slight benefit to 5"

yeeep id say theres a bit of a horse pressure difference that you would want the 5" im not goin for numbers like just doin sct with delete and a mild tune is all i want nothin fancy. any recomendations on what system to go with there is alot of manufactures out there i just dont want to buy a kit that doesnt fit for crap?

I like the fit of my MBRP.

did you install your mbrp kit yourself and if so how did it fit?



yeeep id say theres a bit of a horse pressure difference that you would want the 5" im not goin for numbers like just doin sct with delete and a mild tune is all i want nothin fancy. any recomendations on what system to go with there is alot of manufactures out there i just dont want to buy a kit that doesnt fit for crap?

I would talk to Paul at Complete Performance OR Nate at Performance Truck Products. Either of them will get you setup with a good quality kit.

You will see zero performance benefit with a 5 over a 4. You will probably see some clearance issues with a 5 that a 4 won't have and no matter what anyone tells you a 3.5" downpipe is perfectly fine. 4" downpipes are just an unnecessary pain in the ass.


Mine fits just fine, dare I say Like a Glove!!

http://www.robertakeret.com/photo_lan/oj.jpg



and pretty sure it netted me about 140HP over the stock exhaust, so thats gotta be like 100hp over a 4" system...





Ok, now on a serious note. I have a magnaflow 5" kit that uses a 4" downpipe. I still have my factory spare on the truck (as useless as it is) The exhaust comes within 1/2" of the tire I would say, but no rub or burnt rubber smell or any of that jazz so no trouble there. When I installed my 4" downpipe I had read all the issues people were having with them rubbing on the firewall or rubbing on the up pipe bellows and seemed it was a 50/50 deal with people having trouble and others not, so I decided to risk it. Mine was tough to put in but not bad. Only hard part was pushing the upper downpipe piece up between the up pipes and the firewall, but once the flange was clear it was smooth and easy sailing. Now there is NO spare room (maybe 1/4") around the pipe but it does not rub. Now where I have had rubbing is on the 2nd bolt for the transmission crossmember. It rubbed the first time about 5 miles after installing the exhaust, got it fixed and then it rubbed again after the cab was off for head studs. Otherwise no trouble.


Now with that said I most certainly can't garuntee you won't have any trouble with a 4" downpipe, and as others say the 3.5" will work just the same. Personally I love the deep tone from the 5" system, seems like a bit more of a rumble and I would do it again if I were in the same boat.

I love my 5 in straight pipe, but you can not mount your spare under the truck anymore. Its sounds really crazy when you put your foot in it. I do a lot of HWY driving and it does not bother me at all. I had a 4in with a muffler and I have not noticed much more road noise at HWY speeds. I got whole exhaust for $350 shipped from farm boys diesel.

Results for Ford 6.0L Powerstroke 03-07:Exhaust Systems (http://store02.prostores.com/servlet/farmboysdieselperformance/the-Ford-6.0L-Powerstroke-03-dsh-07-cln-Exhaust-Systems/Categories)

i also have fbd's 5" exhaust with a 33" spare tire. no issues for me

should i go with the 4'' downpipe and is there any way to fix it if it dose rub

Go with the 3.5"
The outlet on your charger is 3.5"....why would you need 4?
You will gain nothing but potentially slower spool. Bigger is not always better.

what is the stock down pipe

so what kind of exhaust are you running unbroken? brand and setup?




thanks for the info and link how was the quality of the kit you got from farm boys? it fit ok? or did you have to "make" it fit?

The quality of the kit was far better than what I was exception. I did not have to "make it fit", but I did end up welding a hanger on to make it look a little cleaner. Over all I would recommend the kit. Also, the shipping was fast. I got it within 4 days of ordering.

size***

Stock is 3.5

Stock is 3.5

Someone told me on another thread that the stocker was 3" :confused:

I have a stock down pipe and a 5inch side pipe(no cat or kitty) on my 06, to be perfectly honest when its at idle it sounds like a muffled wind not a whistle. I am kind of dissapointed with it

stock dp is 3 inch goes to 3.5 past cat.

I have a stock down pipe and a 5inch side pipe(no cat or kitty) on my 06, to be perfectly honest when its at idle it sounds like a muffled wind not a whistle. I am kind of dissapointed with it

hmmm thats odd cuz it sounds like we have a simliar setup(turbo back exhaust?) and mine at idle is definatly a whistle. sounds like a friggin airplane :) which i love not sure why yours is so much different

5" MBRP I love it.

thanks for the input guys, im going to go with the 5" mbrp kit its seems to get good reviews from people i talk to with it.

I just put the 5" MRBP exhaust on my truck and it sounds fricken amazing!!!! Its a 3.5" dp into 5" it's got a resonator I guess but it won't restrict anything. I bought a 6" tip but when I hammer down it raps off damn nice lol!! Definitely would recommend it. (I have a 35" spare under there and no rub about an 1" away actually)

As stated already, you wont get any performance gains by going with a 5" over the 4" the best thing about the 5" is the sound, it has a nice deep tone. I prefer the 5" sound over the 4" .

As stated already, you wont get any performance gains by going with a 5" over the 4" the best thing about the 5" is the sound, it has a nice deep tone. I prefer the 5" sound over the 4" .

a guy that lives down the street from me has the 5'' mbrp on his 04 and it sounds bad ass so thats why im thinkin 5" is the way to go!

got the 5" system on las night. i went with diamond eye system 3.5" dp to 5" all the way back to a 6" tip. seems to me it whistled more at idle with the stock system before now its kinda like a muffled wind. but when you give it a tiny bit of throttle it really whistles laud but i didnt really care much about the whistle so much when it comes on to boost it sings a supper deep pissed off rumble! and thats what i wanted i havnt even turned my stereo on yet i like it so much lol! just wanted to thank you guys for all the input and help its much appreciated :psn:

Iv got a 3.5 dp to 4inch to a 6 inch tip no muffler so it's loud I love it.
It was loud I thought then I installed my 190s and sct=Idp tunes and now it's F-ing loud
I'm a big fan of what Iv got.

I would not recommend a after market dp there a pain in the ass for when your performing repairs.
And I really don't think you make a gain with a bigger dp