Thank you, RBJTech
I saw your cooling mods before and those mods are really great but I have problem with cutting that metal case ! that is really hard for me because I don't have appropriate tools
Also, I made 12V Fan mod on the FANs and that make a lot of noises and this paper piece doesn't really make extra noises. at least with huge FAN noises, I can't hear any more sound from inside of the console !
How you can cut that metal case in that way ? are you using standard drill ?
Thanks again for your help and concern

Yep - drill lots of small holes then cut through them and punch out the centre - the file it all flat. A PITA to do tbh - unless you have the tools then don't even attempt it ...
12v fans ok cool - shouldn't have any issue with airflow then ..
PS - for maximum under board cooling using your mod - then I would also block the ends of the airguide, as that will be the easiest open path for the air to be sucked in and not from under the board, by blocking it, you force the air to come from under the board via the vent holes ..