Thanks Akash1886 for the info. So it's not worth the money spent.
The filter costed me around 5K and then it needs a cleaning kit which that time was around 1200 bucks. I did not go for the kit and cleaned it with normal luke-warm water and it was working fine.
I was looking for one as the in-gear acceleration with AC is not satisfactory, would it make any difference or still the same.
It would improve the performance but by a very minor margin.
What difference you felt with the K&N filter on, the sound of course I guess, slight increase in acceleration/ torque (low/mid/high-end), etc.
In comparison to stock filter, the acceleration was slightly better and the sound of my car is actually high since in my car there is a aftermarket exhaust. With a stock exhaust, there won't be any difference in sound as such.
Regards
Akash