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Old 01-29-2014, 06:15 AM
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down pipe or not

Excuse my ignorance, im very new to diesels. Does my 2003 7.3 have the restrictive down pipe. Im going to a 4 inch exhaust, seems like a waste to install unless i replace down pipe too. I thought the earlier 7.3's had the issues with the down pipe.
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Old 01-29-2014, 07:47 AM
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OH, it's a Big difference! Here's my '02 stock pipe

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Old 01-29-2014, 09:45 AM
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solves that issue, i will be buying a down pipe too.

thanks for the pic
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Old 01-29-2014, 11:31 AM
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Get the downpipe if your doing an exhaust, but the Superdutys do not suffer from the squashed pipe the OBS trucks do...

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Old 01-29-2014, 12:48 PM
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does a turbo back exhaust system include the downpipe?
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Old 01-29-2014, 01:11 PM
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yep, turbo back is what you want.


the obs downpipes were horrible....
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Old 01-30-2014, 05:23 AM
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Another stupid noob question. I don't want a loud exhaust on my truck, I like the quiet stock one and want to keep it like that. Does it make sense to just replace the downpipe with a 4" one, and keep the rest stock?
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Old 01-30-2014, 06:49 AM
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I don't think you can do that unless you use a reducer or something. Just get a 4" with a muffler and it shouldn't be unbearably loud.
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Old 01-30-2014, 07:24 AM
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Im the same way, want performance but not something too loud. My 4" turbo back will have a muffler. Stock muffler has big hole so I may not notice a increase sound.
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Old 01-30-2014, 08:03 AM
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My wife was concerned with that when we added a 4" exhaust to her Excursion... The Exhaust note changed, but nothing noticable at the drivers seat...

However I got some dirty looks when we put the AFE-2 intake in... That was not a fun drive back from Elite Diesel all those years ago... LOL
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