ITB cover or a Velocity stack used on a custom Volkswagen Golf. This Golf has an individual throttle bodies of a Suzuki GXR 1000. The size of the ITBs is 50mm. I designed these covers to help my friend be able to add an air filter box. I am pretty sure you could run this set up without a filter, but wouldn't recommend it. I added two versions for your preference, Both versions have the same amount of chamfer. I used PETG and CO-PA6 to print the covers, I am pretty sure you can get away with using PETG. Since the intake air temperature is lower than PETGS's melting point.