I think that greater hp gains are realized with the engine mods on this car. If you just slap on an intake, it's not going to make much of a difference. However, the catback has to help things out. Also, if you added some headers, I'm sure the intake would be working to its fullest potential. It seems like anything that helps the engine on the exhaling end would make the intake that much more efficient.
BTW, thanks for the comparison. I feel vindicated.