It definitely sound different from stock. There's also a deep growl to it and you can hear the air being sucked in, almost like a small whistle.
Installing it was easy as long you have the tools required, you shouldn't have any issue. Also recommend getting a small hose clamp for one of the tube on the side.
Also, did anyone use the sticker it came with? If so where did you put it? Or where are some good spots on the car?

Not really related but I disconnected the car battery on the car when I was installing the intake and lost my mileage for one of my trips, I was wondering if there a way to add mileage to the trip for the car, my Trip A is the milage I had on the car since I bought it, now it reset back to zero.

 

Unfortunately the mileage is gone.

 

Just my 2 cents, I usually note any significant mileage (like new tires or something like that) on my Lexus maintenance book.