I installed the Trifecta tune in my malibu turbo and the difference is very huge! Before 6500 rpm to shift speeds and now 7000 rpm. The feeling is very nice and the boost is impressive!
You may have lost power. The heat shield with that intake looks decent, but compared to the stock airbox it's more of a hot air intake, even if it breathes better. I'm just making an educated guess though, you'd need to get MAF readings from the OBD port to be sure.
It's also not an especially large intake cone. The one I use has a lot more filter to breathe through.