Which Injector Brand?.
I also have a 3" down pipe but have not be able to tell if it has the ATS upgraded housing. What would be the best way to tell which housing I have?. Just got the truck and no info available from previous owners. I've been lurking here for awhile and really apreciate all the info passed around here.
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94 Crew Cab Dually - Factory IDI Turbo w/ 134,000 Miles - E4od w/4.11s - 3" Exhaust
Welcome to FTE and the IDI diesel forum.
I have no experience with Delphi injectors so I can not help there.
If you have a 3" downpipe on a factory turbo, it has been upgraded.
The stock downpipe was 2.25" ID and looked like it had been run over with a forklift several times.

Left outlet housing is the upgrade.
Right outlet housing is the stock one.



