it has do do with the pulses of exhaust gas hitting the turbine with an equal pause between each pulse. it just helps low end spool really or even just a little midrange.
manifold is very important. its not only shape thinkness is important also. each pipe should be same lenght. we had so many proplems when bulding my cuscom maniflod. its 48mm thick. good for my turbo and set up. we removed radiotor fans to have space between engine and radiator.
This post has been edited by tufy: Feb 28, 2007 - 5:55 AM