3.5 down pipe or 4 inch??? - Ford Powerstroke Diesel Forum
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post #1 of 16 Old 09-12-2009, 10:46 AM Thread Starter
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3.5 down pipe or 4 inch???

IS it better to have the 3.5 inch or 4 inch down pipe off the turbo? My truck is stock except 6637 and a TW chip. What is the pros and cons with the 3.4 vs 4 inch?
Thanks
Aaron

2002 4X4 CC
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Magna Flow 4 inch exhaust
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post #2 of 16 Old 09-12-2009, 10:50 AM
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dude i just put a 4'' tb system on my 02 7.3 and let me tell ya better sound better response and waaay lower egts. i never realized how much the old dp held me back but all i can say is go 4'' youll not regret it

2002 f350 7.3 4x4 mbrp 4''turboback/foil delete/napa6637filtermod/autometers/ts 6 pos chip
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post #3 of 16 Old 09-12-2009, 11:10 AM Thread Starter
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Originally Posted by carnival owner mikey View Post
dude i just put a 4'' tb system on my 02 7.3 and let me tell ya better sound better response and waaay lower egts. i never realized how much the old dp held me back but all i can say is go 4'' youll not regret it
did you have the 3.5 dp and then go to the 4 inch?

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post #4 of 16 Old 09-12-2009, 11:15 AM
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Originally Posted by asa400ex View Post
did you have the 3.5 dp and then go to the 4 inch?
yup sure did

2002 f350 7.3 4x4 mbrp 4''turboback/foil delete/napa6637filtermod/autometers/ts 6 pos chip
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post #5 of 16 Old 09-12-2009, 11:22 AM
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How much do DP's go for on these trucks normally?
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post #6 of 16 Old 09-12-2009, 11:53 AM Thread Starter
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Quote:
Originally Posted by carnival owner mikey View Post
yup sure did
what exhasut system was your 3.5 dp. and what system did you go to for the 4 inch?

thanks

2002 4X4 CC
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Magna Flow 4 inch exhaust
Autometer guages
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post #7 of 16 Old 09-12-2009, 07:28 PM
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definently go with the 4 inch... mechanically wise it just makes since... allows more airflow out which allows more in which allows more fuel which adds power and increases gas mileage.

but remember you can only put as much out as you take in so u need intake and a chip...

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post #8 of 16 Old 09-14-2009, 12:18 PM
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Stock is a 3" DP and I doubt you would notice much by changing from an aftermarket 3.5" to 4" DP. That said, just use 4" all the way. It's only slightly tighter fit for the 4" by the engine and why not go bigger? Price is the same or less for the 4" system.

2000 F350 4wd CC SB PSD
Normal mods plus gauges and PHP chip
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Stock tire size, looks stock.

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post #9 of 16 Old 09-14-2009, 01:20 PM
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Some people feel that they lose a little low end power with a full 4" system. Because of this, some manufacturers offer a 3.5" down pipe to help with spool up. For customers who have a stock truck (no chip or programmer) I suggest going with a 4". If you have a mild to highly modified truck, definitely go with 4". We have both sizes available on our site.



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post #10 of 16 Old 09-14-2009, 02:35 PM
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it would definately lower your egt's, and the difference in price between kits with a 3.5 or a 4 isnt bad.. its definately worth the money... imo

[COLOR="Red"][SIZE="2"]2002 F-350 ext. cab long bed 4x4
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