Arouse the DAMPFHAMMER!
Concerning the dimension calculation there is experience and knowhow here, also there are valid tests, done by 6spd_EK. The main issue of the RSP intake manifold is the stock plenum design. Plenum volume and design as same as the air inlet location and design are the main factors to support better VE. The last where already investigated by BlackNDecker and 6spd_EK, but they didn't post a result of the final dyno...maybe it didn't happen yet?!but there is no experience in calculating their sizes