Finished the installation this morning. It was fairly easy, although the directions were actually for a Prius, so there were some minor steps that were missing. Overall it was pretty easy to figure out. One thing that I wasn't too happy about is that you are left with this coolant hose that used to be attached to the stock air box. The directions state to "zip tie" it up. Well, you can tie it to some wiring on the right side of the engine bay, but that still leaves a pretty long run along the front of the car and there is nothing there to tie it to. So that means it will just bounce up and down as you drive. Since it's rubber and flexible I assume this won't hurt anything, but still it's not ideal. The other thing that wasn't exactly right is the angle of the breather tube. I assume the Prius breather hose comes off at a slightly different angle than ours because the breather tube on the intake isn't exactly at the right angle. The rubber hose fits on ok, but you can tell it's not lined up exactly right. Sound is very nice. At low throttle it sounds stock. At medium throttle you get a nice mellow sound. And full throttle you get a pretty mean sounding growl!