the good and bad of a 4"DP - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 15 (permalink) Old 12-31-2009, 12:26 AM Thread Starter
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the good and bad of a 4"DP

what are your guys thoughts on a 4" downpipe over the stock one? Is it such a small piece that it's almost not noticable?

on top of that, many swear that a 4" exhaust is plenty. would a 5" be just for sound?

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post #2 of 15 (permalink) Old 12-31-2009, 02:10 AM
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Re: the good and bad of a 4"DP

From what I saw you definitely get a EGT drop.

How it helps is on a curve based on power upgrades.

As stock not much at all

Add a chip and you get more benefit

Add A turbo even more

Add new injectors even more.

It and the muffler are the two biggest restrictions.

That is why IMO its best to jsut upgrade the whole exhaust as otherwise you are only moving the point of restriction.

First is the OEM muffler next the down pipe finally the exhaust tubing. But when you consider the time and $$ of swithcing only the first two you really could have done the whole thing for only a bit more $ and time.
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post #3 of 15 (permalink) Old 12-31-2009, 02:17 AM
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Re: the good and bad of a 4"DP

i jus put a 4" dp and 5" the rest of the way on my tow rig. i am loving it so far. have not towed but def. runs cooler and cools down faster. there is no bad side.

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post #4 of 15 (permalink) Old 12-31-2009, 02:58 AM
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Re: the good and bad of a 4"DP

I've got a 4" dp in my 5" system. EGT's stay about ~600* on the highway.

5" isn't needed at moderate power levels but what the heck it sounds good. Some may even report losing low end power...I didn't notice, did notice the higher topend though.

Unless your pushing BIG BIG numbers 5" isn't needed

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post #5 of 15 (permalink) Old 12-31-2009, 06:15 PM
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Re: the good and bad of a 4"DP

my first exhaust mod was a muff delete.. a little gain and cool sound. then i did a 4" DP and even more gain. i think with more upgrades, the DP is more important, but i did notice a jump with just a chip. i now have 4" pipe from the turbo to the wheel with 3 bends in between. i think this is plenty for most of us!

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post #6 of 15 (permalink) Old 12-31-2009, 06:31 PM
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Re: the good and bad of a 4"DP

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Originally Posted by blowinsmoke7.3 View Post
I've got a 4" dp in my 5" system. EGT's stay about ~600* on the highway.

5" isn't needed at moderate power levels but what the heck it sounds good. Some may even report losing low end power...I didn't notice, did notice the higher topend though.

Unless your pushing BIG BIG numbers 5" isn't needed
I have the same system (got a stainless mandrel super cheap on ebay) I love it, another fourm I read awhile ago said the same thing you may lose a little low end with a 5 inch but it is not even noticeable and plus if you want to do powerup grades you already know that you wont have to worry about upgrading your exhaust system. Plus the 5 inch sounds and looks way cooler.

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post #7 of 15 (permalink) Old 12-31-2009, 06:35 PM Thread Starter
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Re: the good and bad of a 4"DP

i ran a 4" straight right when i got the truck, but the 450 needs a different bed then what the 250/350 systems give you. I was able to make it work, but if i end up going with a 5", i may either turn it out before the tire, or run a single stack. not sure yet, but i wanted to see what guys were saying after moving to a 4" DP.

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post #8 of 15 (permalink) Old 12-31-2009, 08:04 PM
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Re: the good and bad of a 4"DP

After ditching my stock DP My egts stayed cooler and cool of faster than before. Im running a 4'' DP to full 5'' system.
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post #9 of 15 (permalink) Old 12-31-2009, 08:42 PM
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Re: the good and bad of a 4"DP

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Originally Posted by SMOK'N BLUE STROKER View Post
After ditching my stock DP My egts stayed cooler and cool of faster than before. Im running a 4'' DP to full 5'' system.
Exactly!

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post #10 of 15 (permalink) Old 12-31-2009, 10:02 PM
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Re: the good and bad of a 4"DP

I'm with these guys. And are you really going to save any $ not getting the DP with your new exhaust? To me it seems like reusing old seals on a new fuel filter, you can, but whats the point?

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