Since I haven't hit on this yet, my opinion of the Airaid intake after about 70 miles or so.
- Smoother power
- Better sound
- Feels like slightly more power
- Car seems to rev quicker.
I did my normal brisk drive to and from work today so it was a good comparison. At idle and low RPMs you don't hear/feel much of a difference but up top she screams. It makes a great low growl when you roll on the throttle from lower RPMs. I have not unhooked the battery yet to allow the ECU to reset.
Like most modifications your opinion will be based on your seat of the pants observations unless you take the time to dyno it. My opinion is it works and offers what I wanted out of an intake on this car.
In the end it = money well spent.