Tube sizes for fabbed EA82T header ?

Hi all , in time need to make a header for an EA82T and need some feedback on what others have done .

Obviously tube size affects exhaust gas pulse damping and I obviously need to get the most pulse (pressure rise) energy into the turbo I can given the siamesed port and wrong cylinders linked exhaust layout of these engines .

From the other thread I started I'm guessing that XT headers are ~ 40mm at the turbo and turbo side head outlets while the opposite side heads "outlet bend" is slightly smaller internally . My guess is that they were trying to alter the pulse timing given the huge difference in engine pipe length between the respective heads .

I want to do a similar kind of thing to the TWE layout and am thinking along the lines of 1 3/4 (1.75) tube which ends up at about 1 5/8 (1.625) ID ?

The up pipe possibly needs to be the same 1 3/4 or at most 2" and match up to whichever turbo I run , ultimately a Garrett GT2854R with the better NS111 turbine grafted in .

Any feedback most welcome , cheers Adrian .

Edited July 10, 200916 yr by discopotato03