Thanks BUSA.
I forgot to mention that FFE, I have seen Mr. Bangalore's Innova with FFE which is very nice, he is getting good FE so I am tempted to do that but I will make sure its silent FFE rather than FFE with amazing sound!
But I need silent car since I hate noise, thats why baught Petrol Innova. After installing K&N Air Filter sound of the car is more silent. I am impressed. Pick up is improved as well, less gear shift with smooth sailing.
When I was struggling with Petrol Swift's pickup my friend suggested K&N Airfilter but I had lost interest in that car and sold it to my friend who waited for 9 months to buy it.
I will soon add FFE for sure.
Cooling paper I mean sun film

my car has double Sun Film (3M and another good brand) Sorry for local language.
Regards,
Ravi.