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just finished my air chamber to solve the TPMS issue and wanted to share..
Pretty simple design using 3" PVC to connect an endcap and a threaded cap. I then installed a shredder valve to the side of the threaded cap. Holds 32psi great, and I can get my sensors outs without having to cut the chamber. Its about 8" and fits in the spare tire area of my trunk perfect. I put a bunch of packing peanuts in the inside to prevent the sensors from bouncing around. Heres the final product:
I would expect those packing peanuts to shrink down to nothing at 32 PSI...
Cardboard would work just fine. But I would still probably investigate the valve stems from iForged instead of this. As I've said before, my wife occasionally drives the IS. If the sensors don't work and the tire is flat, I'll know about it because I'll be buying a new tire and possibly a new rim after she drives a few miles on a flat.