I installed the SHIFT performance CAI on sunday, I must say there is definately an increase in power. The car pulls more effortlessly now, plus the sound is F*%N nuts. I previously had a DIY intake feed and I thought that was loud, but this is just crazy. Not sure about everyone else, but I have also noticed that my stock exhaust is a little louder than previously. I think because the car is able to breathe better. SHIFT were excellent, Sal also gave me rubber hoses to cover the A/C pipes, so the CAI doesnt rub. He really knows his stuff and is very helpful. Highly recommened them to members. Happy customer.