Originally Posted by NI_racing

For anyone that has the ability to measure this or possibly have the info somewhere. Im hunting the Inside diameter for the intake runner where the manifold bolts to the block. Im after the diameter of the stock casting in the 13b for both primary and secondary, both in the block itself and the LIM for both S4 and S5 NA and T2. I know its alot to ask, but if anyone knows any of these inner diameters, or where to find them.... if you could post them itd be alot of help. Thanks