I just ordered a R2C to replace my LMI Airhammer. The Airhammer is nice, but I believe the R2C will reduce IAT's some due to the heat shield.
The R2C is the only intake to do R&D on static pressure drop. The stock intake measured 12" W.G. while their intake dropped pressure differential to 5.7" W.G. On the 6.4L, pressures dropped from 16" W.G. to 5.7" W.G.
For reference, a drop in filter only reduced pressure by .3" W.G.
I like to see the engineering behind the product and the results to back it up. The car will only breath so much air stock, however the flow is obviously increased with those type of pressure drops.
They claim 10-15 rwhp and I believe that is feasible.