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post #1 of 3 Old 04-27-2013, 07:25 AM Thread Starter
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down pipe question

on the 94 to '97's the down pipe flattens out like a cobra's head right after the turbo until it reaches the catalytic converter. Does the '99 - '03 7.3's do the same? or are they nice and round like the after market down pipes for the OBS's?
What size is the down pipe? 3 inches? 3.5 inches? And can one go up in size on the down pipe to 3.5 if it is 3" or to 4" if it is 3.5"?
Thank you. just tryin' to bone up on my 7.3's. My truck is the '97 and I know about those, just want to have info when discussions with friends and others come up. Thanks.
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post #2 of 3 Old 04-27-2013, 07:54 AM
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The stock down pipe on the 99+ is a 3.5 and you can go up to 4. I believe the stock down pipe is pancaked but you can fit a nice round aftermarket down pipe in there.


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2001 7.3L Ext Cab 4x4
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post #3 of 3 Old 04-27-2013, 08:25 AM
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My downpipe on my 01 was 3 I went to 4 no problem it was very easy to install.

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