Understand their point of view too. About a couple of months ago, on i-club.com there was a guy who blew his engine because he didn't know how to tune his engine correctly. He was running 18 psi on stock turbo with CAI and no engine management. He blew his engine running rich.
He then tried to get it fixed under warranty by changing his car back to stock. Unfortunately someone sent the dealerships around him an e-mail the thread and he was denied repairs everywhere.
It's these types of "change it back to stock" people who cause dealerships to be extra wary of their warranties. Ron Price is a good dealership (if you read all the reviews on this board) and they most likely won't void your warranty if it isn't due to your parts.
I hate to say it though, but once you start messing with the boost, I think SOA has grounds to deny warranty work if anything engine related breaks. Sorry.