What? Silicone Valley is a hugely expensive real estate market and it is the very well known nickname for the headquarters of the high-tech computer firms on the west coast. Did you think I meant something else?
SiliconE is a horse of a different color. It is a term for a wide range of polymers. Boob implants, for example, often comprise silicone as the bulk filler material.
So, "siliconE" valley would be a land of fake tits.