Bought an intake complete assembly on ebay. Advertised as '03, has date code for '04. Noticed difference from my '01 ( no fuel press. regulator on fuel rail, no fuel return line) Would I be better to swap in my old fuel rails/regulator, or upgrade to later model fuel lines/regulator?? Fuel rail swap looks easy, but did not know if the other way would have some major benefit.

 

use your old setup with new intake, and use the 04 injectors. same size but probley cleaner lol.

 

The Fuel Systems Are A Non Return Style System On The Newer Trucks. Yours Is A Return Style. Use Ur Old Rails For The New Intake....