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post #1 of 10 Old 12-14-2007, 12:19 AM Thread Starter
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HELP, Im new

I just got me a early 1999 PSD. It is stock and I want to put a 4" downpipe on it. I have been told that I will have to alter my fire wall to get it to fit, does anybody know if this is true. Thanks
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post #2 of 10 Old 12-14-2007, 03:42 AM
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Originally Posted by 250HD View Post
I just got me a early 1999 PSD. It is stock and I want to put a 4" downpipe on it. I have been told that I will have to alter my fire wall to get it to fit, does anybody know if this is true. Thanks
No you shouldn't need to. I didn't.

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post #3 of 10 Old 12-14-2007, 05:05 AM
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I didnt have to on my 99.5....I dont think you have anything to worry about....



03 F250 4wd auto strait pipe quad cab lariat 33x12.50x18

84 K5 blazer CUCV M1008 dana 70 front and rear, detroit lockers front and rear, 45" tractor tires, 6.2 diesel

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post #4 of 10 Old 12-14-2007, 05:10 AM
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post #5 of 10 Old 12-14-2007, 05:32 AM
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RICK


97 F350 CREW CAB 4x4, 7.3 TURBO DIESEL, DIY INTAKE , TW TUNES
GRAND ROCK POWERFLOW STACK KIT W/5" MITRES
3.55 REARS, 3" DOWNPIPE, FPR SHIMMED WITH GAUGE

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post #6 of 10 Old 12-14-2007, 05:53 AM
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No modifications are needed for a 4" down pipe. The early99 and the late99-03 exhaust is all the same. Two hours tops when you do the first one, It takes me less than an hour to do one now.

A sawzall will be needed to get the stock down pipe out. Watch out for the dipstick tube, don't ask.



Early 99 (Born on 11-20-98) F350 CC LWB 4X4
north of 480hp and south of 13.7sec
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post #7 of 10 Old 12-14-2007, 07:04 AM
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Welcome to org!!! No mods needed to fit 4inch DP on my 99.5

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post #8 of 10 Old 12-14-2007, 12:03 PM Thread Starter
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Great, thanks eveyone. Oh yeay, Will I see any difference between 3.5" and 4" down pipes.

Last edited by 250HD; 12-14-2007 at 12:28 PM.
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post #9 of 10 Old 12-14-2007, 12:34 PM
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Some will say that with the 4" down pipe you will loose some low end power some will say that is false. I don not know if it us true or not but that is what I have read.

Maybe someone will have some data to share.

Keep Strokin'

Early 99 (Born on 11-20-98) F350 CC LWB 4X4
north of 480hp and south of 13.7sec
Bored with current setup

Sled Pull and Drag Racing Videos

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post #10 of 10 Old 12-14-2007, 12:52 PM
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