Inliners International Forums General Discussion Blown and Injected help me draw up a turbo header (duggan head)

Unless this is going to be a race engine, long separate runners (as shown) don't really help and increase the amount of work involved.
The tubing is also subject to short life expectancy due to heat cycling and vibration.
They also raise the underhood temperature (already a problem with all turbo installs) by huge increase in surface area for radiation, while losing heat energy to run the turbine.
The flange should be as heavy as your fab skills permit - at least 3/8", 1/2" is better.
Smallest package for best effect is Schedule 40 cast steel "weld ells" - take a look: http://www.sdsefi.com/techheader.htm