I think intercooler pipework is often overlooked alot I've learnt this 1st hand with my skyline the custom work I done to my car shortening pipes and removing bends helped no end to me achieve the result I did. Even more so with my evo! Some of the 1st basic mods on an evo are to ditch the factory restrictive pipework. Evos are quite a well sorted package from factory and when you consider they are over a decade newer than most 33's. They learnt alot in than time period getting stuff right. But when you think about it if a decade later the pipework is holding things back, imagine how much of a resriction the old skyline stuff would be?