3.5" to 4" Downpipe How much better?? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 15 (permalink) Old 04-06-2010, 08:48 PM Thread Starter
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3.5" to 4" Downpipe How much better??

I'm thinking of getting a 4" DP Vs my 3.5" DP that i have when i change from my current stacks to the 4" dual exhaust...That way it will be full 4" What do u guys think get the 4" DP or stick with the 3.5" DP?

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post #2 of 15 (permalink) Old 04-06-2010, 08:52 PM
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Re: 3.5" to 4" Downpipe How much better??

4" downpipe = a drop in velocity. The turbo outet is like 2.5" what do you think the gain would be?

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post #3 of 15 (permalink) Old 04-06-2010, 10:23 PM Thread Starter
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Re: 3.5" to 4" Downpipe How much better??

Hell i dont know Not alot

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post #4 of 15 (permalink) Old 04-06-2010, 10:26 PM
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Re: 3.5" to 4" Downpipe How much better??

i have a 4" turbo back exhaust straight piped and no kittie. Love mine, seems to cool down a little quicker than it did with my 3.5"

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post #5 of 15 (permalink) Old 04-07-2010, 04:59 PM
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Re: 3.5" to 4" Downpipe How much better??

Very little difference. Probably what you'd notice most is a slight drop in low end torque.

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post #6 of 15 (permalink) Old 04-07-2010, 05:29 PM
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Re: 3.5" to 4" Downpipe How much better??

Theres got to be a trade off somewhere. I cant say that I really noticed a drop in any power, then again, took me a while to get passed the difference in tone, along with the turbo whistle.

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post #7 of 15 (permalink) Old 04-07-2010, 06:14 PM Thread Starter
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Re: 3.5" to 4" Downpipe How much better??

Ya i lost low end torque bad with the stacks or maybe it was just they are so damn loud...Ill see if i gain anything back with the 4" duals over my current stacks.

2010 CCSB Afe Intake and dual exhaust
2006 CCLB F-250 Studs,Squeez,EGR delete,RR to AirDog II and a Airraid Intake & Sct Hot tunes *SOLD*
1963 Chevy Nova II 88mm turbo 408 LSX backhalved and tubbed 9.22 @ 145 @ 5000ft BUILT NOT BOUGHT!
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post #8 of 15 (permalink) Old 04-07-2010, 07:10 PM
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Re: 3.5" to 4" Downpipe How much better??

I dupon't think the effort and money for the new pipe would be worth it, but if you just want it then by all means go for it.

I went from stock to 4" downpipe and 5" rest of the way and didn't notice any difference powerband wise. If there was a slight drop in off the line performance I didn't see it, but I haven't driven a truck with a different setup to compare with

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post #9 of 15 (permalink) Old 04-07-2010, 07:24 PM Thread Starter
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Re: 3.5" to 4" Downpipe How much better??

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I dupon't think the effort and money for the new pipe would be worth it, but if you just want it then by all means go for it.

I went from stock to 4" downpipe and 5" rest of the way and didn't notice any difference powerband wise. If there was a slight drop in off the line performance I didn't see it, but I haven't driven a truck with a different setup to compare with
Ya i will just stay with the 3.5".....I think the stacks made me lose power but hell my butt dyno might be off I will see what this 4" dual does Im just tired of the damn drone going down the highwaywith the stacks 4" duals with a muffler FTW

2010 CCSB Afe Intake and dual exhaust
2006 CCLB F-250 Studs,Squeez,EGR delete,RR to AirDog II and a Airraid Intake & Sct Hot tunes *SOLD*
1963 Chevy Nova II 88mm turbo 408 LSX backhalved and tubbed 9.22 @ 145 @ 5000ft BUILT NOT BOUGHT!
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post #10 of 15 (permalink) Old 04-07-2010, 08:04 PM
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Re: 3.5" to 4" Downpipe How much better??

if i was to do it again i would just have left my 3.5" dp in

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