I am going to be building a dual 2.25" exhuast for my inline 6 BMW. There are two separate exhuast headers for cylinders 1-3 and 4-6. I am going to use an x pipe in the exhaust but have not been able to find any information on what the proper distance is to install if from the header collectors...
It seems theres been plenty of in depth threads about plenum size and intake design in general but I havent found any definitive information about plenum requirements for an individual throttle body intake manifold. I would assume runner length and diameter are still the main players but how...
