From what I recall, when I bought my tc with the TRD lowering kit, the salesman said it will not void the warranty if it is installed when I make the initial pick-up of the car. Now he was a salesman so I don't know how true it is, but it made sense to me.
Also, snowwhitetc, I had a similar noise issue with mine. I bought the car in October(in NY it gets chilly), and I noticed some noise from the back end as well. When I test drove it there wasn't any, but after it was lowered and all that I would hear almost a stretching sound while turning semi-fast. I let it go for a bit and it seemed to have worked itself out. Maybe when it gets cold it'll happen again. If so I'll bring it the dealer and have them look at it.
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