It's was tested on a FA20DIT from a 2018 Subaru WRX. We (My buddy and I) used a shopvac to suck the walnut out and the centre hole is for your blowing nozzle. Worked pretty great but we had to trim a bit of it out.
This is my very first selfmade model
Printed using PETG but PLA will work fine.
The author marked this model as their own original creation.