Since my 4k isn't stock, you couldn't really compare the differences before and after the induction. I recommend it, as with my 4k it HAS increased the top speed and of the line acceleration. Although at times, the induction noise can become quite annoying, there is nothing better than and old banger, sucking its **** off.
I had the pod and induction pipe running for a little while, with another piece of plastic pipe running from the front of the car up to the pod. The increase in performance changed considerably, but as it took forever for the cold air to rush from the front of the pipe to the end, it was not as effective as direct airflow through the bonnet scoop.
With the pod, induction pipe, and cold air pipe, it also takes up a lot of room in the engine bay.
On a worked 4k, proper cold air induction is almost necessary, I think…
* Even just with the scoop, there is an incredible difference driving in the heat of the day, compared to the coolness of the night…