I'm considering making my own headers for my 3.0 and have some questions for you guys who have aftermarket headers Downey, NWOR, Throley doesn't matter. here's my questions:

Size of primaries? Just the diameter is fine, length isn't so important for what I want to do.

Final size of collecters.

Thats pretty much it. Cheers!

 

collectors... i swear NWOR are 2.25 (i think) and (i know) downey is 2.5

primaries? mmmmmm 1.25 OD for both kinds.... NWOR are defenitly use heavyer material.