Here's the pre-production intake manifold for K-Series engine, this is another option than getting the RRC manifold from honda. Skunk2's intake manifold is in its pre-production phase and pricing also has not been announced yet. So expect good things from Skunk2
Source
Skunk2
http://www.civinfo.com/forum/type-r/28723-skunk2-k-series-intake-manifolds.html
Source
Skunk2
http://www.civinfo.com/forum/type-r/28723-skunk2-k-series-intake-manifolds.html