I used the aluminum case yeah racing fans I went through 3 of them in a practice day at the track. 1 broke after landing a hard jump, so I doubled up the tape on the bottom to give it more cushion. That didn’t help it broke on the same jump 15 second into a lap. Then the last one broke a couple laps later. Now I’m using the muchmore 30mm turbo fan and it seems to be holding up well. I have about 5 weeks right now on the muchmore.