I just checked the price, and they were actually $70 each. So, I might have been thinking they were much cheaper when I first discussed this with you.TX has some in his wheels and they work just fine (plus they are much cheaper than the Audi branded version).
I left my TPM sensors in my stock wheels too.
Maybe I dreamed it? Damn memory!!!
M-B systems do this also.I also own an Infiniti FX45 with TPMS and the cool thing about the Infiniti is that you can check the TPMS information screen and it will give the exact, instantaneous tire pressure in each tire. I wonder why Audi didn't do this.