Nissan Skyline BNR32 GT-R Garage Yoshida Floor Set

Can be installed without this much variation.
If you can remove all the seats and turn the carpet half by half, you can install it.
(Although it is a model-specific design, it is not packed up to the very end for ease of construction.)

The particular point is this material developed by Daiko Rubber.
It is a double structure of materials that are effective for both soundproofing and heat insulation.
If it's just soundproofing, a lead mat often used for audio etc. works well, but weight is very important as a material to be installed in a sports car.