Actually Several members here have reported small losses afte installing aftermerket CAIs. I havent done any tests but here is my idea. The aftermarket units definitley have a higher CFM filter. The tubing might even have less restriction. But the tubes are made of metal which get hot and stay hot. This could be whats causing the loss. The stock setup has a rubber
flex tube which acts as better insulater.
The Roe SC on the other hand has NO CAI which isnt that strange since it is relatively new and Im sure will have one soon. It has a baffle which helps draw cooler air but could definitely use a CAI