3d printing is awesome technology.
This intake looks excellent, and similar design to what many high rpm/performance Jap engines would use.
I dont think necessarily the long runners always hurt rpm's, but lack of plenum volume can.
If you consider a lot of ITB setups would have reasonably long runners, they excel at high rpm's
http://www.lsxtv.com/news/vararam-un...or-ls-engines/