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Hi guys I have a 1997 7.3l with a 3inch down pipe to 4inch turbo back exhaust. I’m trying to put a 4inch down pipe but can’t find any company or website that sales them. In order to get a 4inch down pipe do you have to fabricate one yourself or is there a company that makes them.
 

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It is a total fab job from the turbo down.

You will also most likely destroy the firewall getting it in. A 3" is tight enough, even those who have fabed up a 3 1/2" have destroyed the firewall getting it to where it won't rub.
 
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Hi guys I have a 1997 7.3l with a 3inch down pipe to 4inch turbo back exhaust. I’m trying to put a 4inch down pipe but can’t find any company or website that sales them. In order to get a 4inch down pipe do you have to fabricate one yourself or is there a company that makes them.
4" is past the point of diminishing returns. Your restriction is in the turbo.
 
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