4" Downpipe Q's. - Ford Powerstroke Diesel Forum
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post #1 of 17 Old 10-12-2007, 05:33 PM Thread Starter
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4" Downpipe Q's.

I just wanted to double check something. I called to order some exhuast today and wanted to make sure that I was going to get a 4" downpipe and a 5" the rest of the way out and got told that he only had 3.5" downpipes and that I wouldn't want a 4" dowpipe because I would need a hammer to make it fit. I thought that on the 99.5-2003 7.3L that the 4" downpipe had plenty of room. I know it looks like I could almost fit a 4.5" or 5" dowpipe but maybe I am missing a skinny spot somewhere. I just don't understand because I was under the impression only the 6.0's or OBS trucks had trouble with 4", but this place was supposed to be highly rated from everyone on here and I specifically told them 2000 F350 w/7.3L. Looking forward to getting this thing straight piped...Just need to get some exhaust ordered. Thanks.
-Aaron

2000 Ext. Cab F350 SRW, 6" Skyjacker lift on front/8" BDS Springs on rear w/NO blocks, 37x13.50 Nitto Mud Grappler's, Aftermarket Front Bumper

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post #2 of 17 Old 10-12-2007, 05:36 PM
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everybody ive heard put in an actual 4" dp had to beat the fire wall, 73 or a 60

2004 Excursion
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post #3 of 17 Old 10-12-2007, 05:50 PM Thread Starter
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Hmmm...That kind of sucks. I don't want to beat in the firewall, but really had my heart set on at least a 4" all the way back. I know a bunch of you have the 4" downpipe....Any of them fit with out "performance modifications" to the firewall?
-Aaron

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post #4 of 17 Old 10-12-2007, 05:54 PM
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Not on a 99 - 03 7.3L -- you can fit 4" no problem...

the 6.0 is a slightly different
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post #5 of 17 Old 10-12-2007, 06:00 PM Thread Starter
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Woo-hoo! There is hope after all....lol. Since the responses are split right now I would like a few more confirmations or denials before I go ahead and order it. Looks like I might just end up with 4" all the way back from the turbo though instead of the 5". I guess it should be fine.

On a side note.....Does anyone know about how much the EGT's will go down from the factory exhuast w/ performance muffler to a 4" straight pipe setup?
-Aaron

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post #6 of 17 Old 10-12-2007, 06:01 PM
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I got pictures if you want to see those for proof

4" Turbo back!
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post #7 of 17 Old 10-12-2007, 06:09 PM Thread Starter
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I don't need to see pictures. I believe it worked on yours, just making sure it isn't one of those things that only works on some trucks. I don't want to spout off names. (Just don't seem right to me) I just wanted to make double/triple/quadruple sure before I ordered it, because I was told that by a reputable place, and it threw me off. I thought I had done better research than that and it made me feel like an idiot when I told them I wanted that setup and they told me it wouldn't really work. Anyhow, thanks for the reply.
-Aaron

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post #8 of 17 Old 10-12-2007, 06:11 PM
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I had no problem getting the 4" in the truck... oh, and there was just another post tonight about a guy installing a 4" turbo back also
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post #9 of 17 Old 10-12-2007, 06:18 PM
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It slipped right on up in there, took about 15 seconds to snake it up there, no problem at all.

June of 1999 7.3L F-250 CCSB
Dp-Tuner F5 w/8 Tunes. Autometer Colbalt Gauges. 5" Exhaust. 2004 6.0 SCT and Headstuds 4" exhaust
2008 6.4L project truck.
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post #10 of 17 Old 10-12-2007, 06:26 PM
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Thats 2
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